Theoretical Quotes & Sayings

One of the principal objects of theoretical research in my department of knowledge is to find the point of view from which the subject appears in its greatest simplicity. — J. Willard Gibbs

The pace of science forces the pace of technique. Theoretical physics forces atomic energy on us; the successful production of the fission bomb forces upon us the manufacture of the hydrogen bomb. We do not choose our problems, we do not choose our products; we are pushed, we are forced
by what? By a system which has no purpose and goal transcending it, and which makes man its appendix. — Erich Fromm

There is no secret in attaining God. In the path of Enlightenment, any theoretical mystery-mongering preacher that weakens the mind, should be rejected at once. Science has no secrets. The very purpose of it is to unravel the secrets of Nature and the Universe. That is why it is so beautiful. And so should be the path of Enlightenment. — Abhijit Naskar

History shows that the human mind, fed by constant accessions of knowledge, periodically grows too large for its theoretical coverings, and bursts them asunder to appear in new habiliments, as the feeding and growing grub, at intervals, casts its too narrow skin and assumes another. — Charles Darwin

Faith and daily life, faith and work-these are not separate things. They are one and the same. To think of them as separate-that faith is faith, and work is work-is theoretical faith. Based on the recognition that work and faith are one and the same, we should put one hundred percent of our energy into our jobs and one hundred percent into our faith, too. When we resolve to do this, we enter the path of victory in life. Faith means to show irrefutable proof of victory amid the realities of society and in our own daily lives. — Daisaku Ikeda

There is no escaping the fact, however, that social science research on the distribution of wealth was for a long time based on a relatively limited set of firmly established facts together with a wide variety of purely theoretical speculations. — Thomas Piketty

We live in a world in which it is impossible to anticipate most of the contingencies that will arise. Neither the political context, nor the inventions, nor the fashions, nor the weather, nor the climate are precisely specifiable in advance. There is, in the real world, no possibility of working with an abstract space of all the contingencies that may evolve. To do real economics, without mythological elements, we need a theoretical framework in which time is real and the future is not specifiable in advance, even in principle. It is only in such a theoretical context that the full scope of our power to construct our future can make sense. — Lee Smolin

The existential attitude is one of involvement in contrast to a merely theoretical or detached attitude. "Existential" in this sense can be defined as participating in a situation, especially a cognitive situation, with the whole of one's existence ... There are realms of reality or - more exactly - of abstraction from reality in which the most complete detachment is the adequate cognitive approach. Everything which can be expressed in terms of quantitative measurement has this character. But it is most inadequate to apply the same approach to reality in its infinite concreteness. A self which has become a matter of calculation and management has ceased to be a self. It has become a thing. You must participate in a self in order to know what it is. But by participating you change it. In all existential knowledge both subject and object are transformed by the very act of knowing. — Paul Tillich

During the time that Landsteiner gave me an education in the field of immunology, I discovered that he and I were thinking about the serologic problem in very different ways. He would ask, What do these experiments force us to believe about the nature of the world? I would ask, What is the most. simple and general picture of the world that we can formulate that is not ruled by these experiments? I realized that medical and biological investigators were not attacking their problems the same way that theoretical physicists do, the way I had been in the habit of doing. — Linus Pauling

Darwin himself, in his day, was unable to fight free of the theoretical errors of which he was guilty. It was the classics of Marxism that revealed those errors and pointed them out. — Trofim Lysenko

If you find that you're spending almost all your time on theory, start turning some attention to practical things; it will improve your theories. If you find that you're spending almost all your time on practice, start turning some attention to theoretical things; it will improve your practice. — Donald Knuth

It is that of increasing knowledge of empirical fact, intimately combined with changing interpretations of this body of fact - hence changing general statements about it - and, not least, a changing a structure of the theoretical system. — Talcott Parsons

From the age of 13, I was attracted to physics and mathematics. My interest in these subjects derived mostly from popular science books that I read avidly. Early on I was fascinated by theoretical physics and determined to become a theoretical physicist. I had no real idea what that meant, but it seemed incredibly exciting to spend one's life attempting to find the secrets of the universe by using one's mind. — David Gross

Our users are trapeze artists, high school football coaches - I got cornered by a couple of theoretical physicists who said Dropbox lets them collaborate across the world and share their experiments' results. They were raving about how it's driving their research. — Drew Houston

To be worshiped is not freedom. — Shulamith Firestone

Mediocre theoretical physicists make no progress. They spend all their time understanding other people's progress. — Jeff Bezos

The most dangerous type of atheism is not theoretical atheism, but practical atheism -that's the most dangerous type. And the world, even the church, is filled up with people who pay lip service to God and not life service. And there is always a danger that we will make it appear externally that we believe in God when internally we don't. We say with our mouths that we believe in him, but we live with our lives like he never existed. That is the ever-present danger confronting religion. That's a dangerous type of atheism. — Martin Luther King Jr.

All theoretical chemistry is really physics; and all theoretical chemists know it. — Richard P. Feynman

The career of a young theoretical physicist consists of treating the harmonic oscillator in ever-increasing levels of abstraction. — Sidney Coleman

Feminism as a theoretical enterprise is approached differently by Black women depending on where we are. There are more reformist Black women who tend to use the phrase "Black feminism". — Bell Hooks

Discussions about how God reveals himself to people have little meaning in a purely theoretical framework. — Derek Morphew

So far I have been speaking of theoretical science, which is an attempt to understand the world. Practical science, which is an attempt to change the world, has been important from the first, and has continually increased in importance, until it has almost ousted theoretical science from men's thoughts. — Bertrand Russell

But Friedman seemed to share Friedrich Hayek's extreme and inaccurate view that socialism of the sort that Britain embraced under the old Labour Party was incompatible with democracy, and I don't think that there is a good theoretical or empirical basis for that view. The Road to Serfdom flunks the test of accuracy of prediction! — Richard Posner

What I do is very theoretical. It won't necessarily have implications for anything anyone is doing tomorrow, yet you know that there's a sense of progress in science, and as we understand more, it just turns out that, somehow, the world evolves with us. — Lisa Randall

Reason drives your search to make sense of the world by pushing you to ask why things are as they are. For theoretical reason, the outcome of that search becomes science; for practical reason, the outcome is a more just world. — Susan Neiman

In the Java world, security is not viewed as an add-on a feature. It is a pervasive way of thinking. Those who forget to think in a secure mindset end up in trouble. But just because the facilities are there doesn't mean that security is assured automatically. A set of standard practices has evolved over the years. The Secure Coding Standard for Java is a compendium of these practices. These are not theoretical research papers or product marketing blurbs. This is all serious, mission-critical, battle-tested, enterprise-scale stuff. — James Gosling

At the turn of the twentieth century, the first wave of academic political scientists attacked some of their theoretical predecessors for the supposed mistake of assuming that human beings were entirely rational. This mistake had allegedly been made by politicians and theorists who had tried to appeal to voters in terms of purely rational argument. The new political scientists triumphantly pointed out that image, stereotype, the emotions arising in crowds, family background, and many other irrational factors were actually the main determinants of political behaviour. — Kenneth Minogue

The main concern of the study is with the outline of a theoretical system. Its minor variations from writer to writer are not a matter of concern to this analysis. — Talcott Parsons

Many scientists (the most notable being Albert Einstein) think in visual, spatial, and physical images rather than in mathematical terms and words. (N.B.: That the theoretical physicist, Stephen Hawking, used an arboreal term to picture the cosmos [i.e., affirming that the universe "could have different branches,"] is a tribute to his [very visual] primate brain.) — David B. Givens

A healthy economics has got to have both conceptual, theoretical research and applied, empirical research. — Edmund Phelps

From the Greek word for spectators, theatai, the later philosophical term "theory" was derived, and the word "theoretical" until a few hundred years ago meant "contemplating," looking upon something from the outside, from a position implying a view that is hidden from those who take part in the spectacle and actualize it. The inference to be drawn from this early distinction between doing and understanding is obvious: as a spectator you may understand the "truth" of what the spectacle is about; but the price you have to pay is withdrawal from participating in it. — Hannah Arendt

Is it needy? It's not. We don't need each other. We just really, really enjoy each other. And we're good together. We're good people together. And I have the funniest feeling. I can really, truly touch this all, this happiness and the sadness too, I can trace all of it with my fingers. It isn't theoretical or distant. This feels like me. This is me. I love him, and, for the first time in a relationship, I also like me. Every time he says "I love you," I answer, "I believe you. — Emma Forrest

Value is consequently the necessary theoretical starting point whence we can elucidate the peculiar phenomenon of prices resulting from capitalist competition. — Rudolf Hiferding

If the aim of physical theories is to explain experimental laws, theoretical physics is not an autonomous science; it is subordinate to metaphysics. — Pierre Duhem

The fundamental importance of the subject of molecular diffraction came first to be recognized through the theoretical work of the late Lord Rayleigh on the blue light of the sky, which he showed to be the result of the scattering of sunlight by the gases of the atmosphere. — C. V. Raman

In art, in taste, in life, in speech, you decide from feeling, and not from reason ... If we were obliged to enter into a theoretical deliberation on every occasion before we act, life would be at a stand, and Art would be impracticable. — William Hazlitt

The theoretical conclusions of the Communists are in no way based on ideas or principles that have been invented, or discovered, by this or that would -be universal reformer. They merely express, in general terms, actual relations springing from an existing class struggle, from a historical movement going on under our very eyes. The abolition of existing property relations is not at all a distinctive feature of communism. All property relations in the past have continually been subject to historical change consequent upon the change in historical conditions. — Karl Marx

When you ask what are electrons and protons I ought to answer that this question is not a profitable one to ask and does not really have a meaning. The important thing about electrons and protons is not what they are but how they behave, how they move. I can describe the situation by comparing it to the game of chess. In chess, we have various chessmen, kings, knights, pawns and so on. If you ask what chessman is, the answer would be that it is a piece of wood, or a piece of ivory, or perhaps just a sign written on paper, or anything whatever. It does not matter. Each chessman has a characteristic way of moving and this is all that matters about it. The whole game os chess follows from this way of moving the various chessmen. — Paul A.M. Dirac

The foundations of population genetics were laid chiefly by mathematical deduction from basic premises contained in the works of Mendel and Morgan and their followers. Haldane, Wright, and Fisher are the pioneers of population genetics whose main research equipment was paper and ink rather than microscopes, experimental fields, Drosophila bottles, or mouse cages. Theirs is theoretical biology at its best, and it has provided a guiding light for rigorous quantitative experimentation and observation. — Theodosius Dobzhansky

It's time that Islam should be redefined by the world based upon, the goodness of all the peace-loving Muslims, instead of the theoretical teachings of some books, be it Quran or the Hadith. — Abhijit Naskar

Black holes provide theoreticians with an important theoretical laboratory to test ideas. Conditions within a black hole are so extreme, that by analyzing aspects of black holes we see space and time in an exotic environment, one that has shed important, and sometimes perplexing, new light on their fundamental nature. — Brian Greene

The fear of speculation, the ostensible rush from the theoretical to the practical, brings about the same shallowness in action that it does in knowledge. It is by studying a strictly theoretical philosophy that we become most acquainted with Ideas, and only Ideas provide action with energy and ethical significance. — Friedrich Wilhelm Joseph Schelling

But theoretical, imagined suffering is not what distresses a man and destroys his peace of mind. Only what you have seen with pitying eyes can really shake you. — Stefan Zweig

Actually, I was more or less determined to be a theoretical physicist at the age of thirteen. — David Gross

The amount of detailed information which an individual has at his command and his theoretical elaborations of the same are mutually dependent; they grow in and through each other. — Hermann Ebbinghaus

Philosophers of science have repeatedly demonstrated that more than one theoretical construction can always be placed upon a given collection of data. — Thomas Kuhn

To say this, however, is not to claim that it was the object of theoretical study. — Aristotle.

A recent book by University of Chicago professor of philosophy and law Brian Leiter outlines what I believe will become the theoretical consensus that does away with religious liberty in spirit if not in letter. "There is no principled reason," he writes, "for legal or constitutional regimes to single out religion for protection." . . . Evoking the principle of fairness, Leiter argues that everybody's conscience should be accorded the same legal protections. Thus he proposes to replace religious liberty with a plenary "liberty of conscience."

Leiter's argument is libertarian. He wants to get the government out of the business of deciding whose conscience is worth protecting. This mentality seems to expand freedom, but that's an illusion. In practice it will lead to diminished freedom, as is always the case with any thoroughgoing libertarianism. — R. R. Reno

Contemporary art photography is paradoxical. Anyone can look at it and form an opinion about what they see. Yet it usually represents aesthetic and theoretical positions that only a small minority of well-informed viewers can access. — Lucy Soutter

I used to refer to myself as a 'theoretical anorexic,' just as crazy when it came to body image, but saved by a lack of self-discipline. My daughters do everything better than I do - they're smarter, more beautiful, happier. What if they end up better at anorexia, too? — Ayelet Waldman

When I was a college student at Yale, I was studying physics and mathematics and was absolutely intent on becoming a theoretical physicist. — James Rothman

This kind of overall way of thinking is not only a fertile source of new theoretical ideas: it is needed for the human mind to function in a generally harmonious way, which could in turn help to make possible an orderly and stable society. — David Bohm

A common refrain among theoretical physicists is that the fields of quantum field theory are the "real" entities while the particles they represent are images like the shadows in Plato's cave. As one who did experimental particle physics for forty years before retiring in 2000, I say, "Wait a minute!" No one has ever measured a quantum field, or even a classical electric, magnetic, or gravitational field. No one has ever measured a wavicle, the term used to describe the so-called wavelike properties of a particle. You always measure localized particles. The interference patterns you observe in sending light through slits are not seen in the measurements of individual photons, just in the statistical distributions of an ensemble of many photons. To me, it is the particle that comes closest to reality. But then, I cannot prove it is real either. — Victor J. Stenger

Okay, now what to do if I don't like this person like him or her??
SAy a lie?
- Is it okay?
(So far theoretical truth, comes from the lies, the lies are the beginning...)
Say a truth?
- So far it hurts,... — Deyth Banger

Working in theoretical systems can take away the juice. It can also be very beautiful, but when you're trying to satisfy a theoretical principle rather than a sonic reality, then it can become dry. — Pauline Oliveros

The only purpose of education is to teach a student how to live his life-by developing his mind and equipping him to deal with reality. The training he needs is theoretical, i.e., conceptual. He has to be taught to think, to understand, to integrate, to prove. He has to be taught the essentials of the knowledge discovered in the past-and he has to be equipped to acquire further knowledge by his own effort. — Ayn Rand

Indeed we may consider the engine as the material and mechanical representative of analysis, and that our actual working powers in this department of human study will be enabled more effectually than heretofore to keep pace with our theoretical knowledge of its principles and laws, through the complete control which the engine gives us over the executive manipulation of algebraical and numerical symbols. — Ada Lovelace

Evolutionary dynamics has no need of vast abstract spaces, like all the possible viable animals, DNA sequences, sets of proteins, or biological laws. Better, as the theoretical biologist Stuart A. Kauffman proposes, to think of evolutionary dynamics as the exploration in time by the biosphere of what can happen next: the "adjacent possible." The same goes for the evolution of technologies, economies, and societies. — Anonymous

The strictly theoretical and so attractive dream of possible equality had been traded for the worst authoritarian nightmare in history when it was applied to reality, understood, with good reason (more, in this case), as the only criterion of truth. — Leonardo Padura

The facile economic and psychological debunking of the theoretical life cannot do away with its irreducible beauties. — Allan Bloom

Economics is a theoretical science and as such abstains from any judgement of value. It is not its task to tell people what ends they should aim at. It is a science of the means to be applied for attainment of ends chosen, not, to be sure, a science of the choosing of ends. Ultimate decisions, the valuations and the choosing of ends, are beyond the scope of any science. Science never tells a man how he should act; it merely shows how a man must act if he wants to attain definite ends. — Ludwig Von Mises

It was at this moment that I wrote my first important paper in theoretical physics. I was 32 years old, 5 years beyond the alleged age of senility for theorists. — Robert B. Laughlin

A Critique of pure Reason, i.e. of our faculty of judging a priori according to principles, would be incomplete, if the Judgement, which as a cognitive faculty also makes claim to such principles, were not treated as a particular part of it; although its principles in a system of pure Philosophy need form no particular part between the theoretical and the practical, but can be annexed when needful to one or both as occasion requires. — Immanuel Kant

The reason Dick's physics was so hard for ordinary people to grasp was that he did not use equations. The usual theoretical physics was done since the time of Newton was to begin by writing down some equations and then to work hard calculating solutions of the equations. This was the way Hans and Oppy and Julian Schwinger did physics. Dick just wrote down the solutions out of his head without ever writing down the equations. He had a physical picture of the way things happen, and the picture gave him the solutions directly with a minimum of calculation. It was no wonder that people who had spent their lives solving equations were baffled by him. Their minds were analytical; his was pictorial. — Freeman Dyson

If we analyse the supernova data by assuming the Copernican principle is correct and get out something unphysical, I think we should start questioning the Copernican principle ... . Whatever our theoretical predilections, they will in the end have to give way to the observational evidence. — George F. R. Ellis

My take on the various components of Maoist politics varies, depending on the philosophical, theoretical, strategic, or methodological element in question. In general, I consider Maoism to be an internal critique of Stalinism that fails to break with Stalinism. Over many years, Mao developed a critical understanding of Soviet society, and of the negative symptoms it displayed. But at the same time, he failed to locate the cause of these symptoms in the capitalist social relations of the USSR and so retained many shared assumptions with the Stalinist model in his own thinking. — Elliott Liu

It is hard to see how one could begin to develop a quantum-theoretical description of brain action when one might well have to regard the brain as "observing itself" all the time! — Roger Penrose

There's the famous quote that if you want to understand how animals live, you don't go to the zoo, you go to the jungle. The Future Lab has really pioneered that within Lego, and it hasn't been a theoretical exercise. It's been a real design-thinking approach to innovation, which we've learned an awful lot from. — Jorgen Vig Knudstorp

Classically, cosmetics companies will take highly theoretical, textbookish information about the way that cells work - the components at a molecular level or the behavior of cells in a glass dish - and then pretend it's the same as the ultimate issue of whether something makes you look nice. "This molecular component," they say, with a flourish, "is crucial for collagen formation." And that will be perfectly true (along with many other amino acids which are used by your body to assemble protein in joints, skin, and everywhere else), but there is no reason to believe that anyone is deficient in it or that smearing it on your face will make any difference to your appearance. In general, you don't absorb things very well through your skin, because its purpose is to be relatively impermeable. When you sit in a bath of baked beans for charity, you do not get fat, nor do you start farting. — Ben Goldacre

Einstein's secretary once said that if Einstein were born among the polar bears, he would still be Einstein. But unless polar bears were well versed in theoretical physics, that is not true. Einstein would not be Einstein. Which is not to take anything away from Einstein, or the polar bears, but simply to point out that he was part of a creative ecology, and trying to isolate him from it is not only silly but futile. — Eric Weiner

The problem of an eidos in history, hence, arises only when a Christian transcendental fulfillment becomes immanentized. Such an immanentist hypostasis of the eschaton, however, is a theoretical fallacy. — Eric Voegelin

An open mind, in questions that are not ultimate, is useful. But an open mind about the ultimate foundations either of Theoretical or of Practical Reason is idiocy. If a man's mind is open on these things, let his mouth at least be shut. He can say nothing to the purpose. Outside the Tao there is no ground for criticizing either the Tao or anything else. — C.S. Lewis

Will posterity believe that, while the Press has swarmed with inflammatory productions that tend to prove the blessing of theoretical confusion and speculative licentiousness, not one writer of talent has been employed to refute and confound the fashionable doctrines, nor the least care taken to disseminate works of another complexion. — Arthur Young

A second possible approach to general systems theory is through the arrangement of theoretical systems and constructs in a hierarchy of complexity, roughly corresponding to the complexity of the "individuals" of the various empirical fields ... leading towards a "system of systems." ... I suggest below a possible arrangement of "levels" of theoretical discourse ... (vi) ... the "animal" level, characterized by increased mobility, teleological behavior and self-awareness ... — Kenneth E. Boulding

The greatest cost of the specialization of technological life - and out of which all other damages are birthed - is arguably our separation from the practical and enriching sense of ourselves as embodied beings. When we are alienated from the wisdom of the body, our lives become theoretical and abstract, and we are distanced from the direct, felt sense of living. — Richard Strozzi-Heckler

This irrelevance of molecular arrangements for macroscopic results has given rise to the tendency to confine physics and chemistry to the study of homogeneous systems as well as homogeneous classes. In statistical mechanics a great deal of labor is in fact spent on showing that homogeneous systems and homogeneous classes are closely related and to a considerable extent interchangeable concepts of theoretical analysis (Gibbs theory). Naturally, this is not an accident. The methods of physics and chemistry are ideally suited for dealing with homogeneous classes with their interchangeable components. But experience shows that the objects of biology are radically inhomogeneous both as systems (structurally) and as classes (generically). Therefore, the method of biology and, consequently, its results will differ widely from the method and results of physical science. — Walter M. Elsasser

There are theoretical reformers at all times, and all the world over, living on anticipation. — Henry David Thoreau

The study of theology is not merely a theoretical exercise of the intellect. It is a study of the living God, and of the wonders of all his works in creation and redemption. We cannot study this subject dispassionately! We must love all that God is, all that he says, and all that he does. "You shall love the Lord your God with all your heart" (Deut. 6:5). Our response to the study of the theology of Scripture should be that of the psalmist who said, "How precious to me are your thoughts, O God!" (Ps. 139:17). In the study of the teachings of God's Word, it should not surprise us if we often find our hearts spontaneously breaking forth in expressions of praise and delight like those of the psalmist. — Wayne A. Grudem

It is tribute to how far we have come in theoretical physics that it now takes enormous machines and a great deal of money to perform experiments whose results we can not predict. — Stephen Hawking

As to the efficacy of the policy recommended by Rostow, it speaks for itself: no country, once underdeveloped, ever managed to develop By Rostow's stages. Is that why Rostow is now trying to help the people of Vietnam, the Congo, the Dominican Republic, and other underdeveloped countries to overcome the empirical, theoretical, and policy shortcomings of his manifestly non-communist intellectual aid to economic development and cultural change by bombs, napalm, chemical and biological weapons, and military occupation? — Andre Gunder Frank

Thus, the weight of my criticism is directed against the inadequacy of the theoretical foundations of the laissez-faire doctrine upon which I was brought up and for many years I taught — John Maynard Keynes

Girl power reduces the theoretical complexity of feminism to a cheery slogan ("GIRLS KICK ASS!"); it represents the ultimate commodification of empowerment; it reinforces the simplistic conception of feminism as being, at heart, "all about choices." But most of all, it it grabbed the rhetoric from one of the most potentially powerful, yet woefully misunderstood, feminist uprisings of my generation, discarded every ounce of political heft, and reduced it to cheap iron-on letters on a baby T. — Rachel Fudge

Mental illness, of course, is not literally a 'thing' - or physical object - and hence it can 'exist' only in the same sort of way in which other theoretical concepts exist. — Thomas Szasz

Whenever the truth is uncovered, the artist will always cling with rapt gaze to what still remains covering even after such uncovering; but the theoretical man enjoys and finds satisfaction in the discarded covering and finds the highest object of his pleasure in the process of an ever happy uncovering that succeeds through his own efforts. — Friedrich Nietzsche

On a level, they might be perfect for one another, but it's a theoretical perfection only, compromised by timing. Their bests passed one another on the way to here, and now exist epochs apart. — Billy O'Callaghan

The young were always theoretical; only the middle-aged could realize the deadliness of principles. To subdue one's self to one's own ends might be dangerous, but to subdue one's self to other people's ends was dust and ashes. Yet there were those, still more unhappy, who envied even the ashy saltiness of those dead sea apples. — Dorothy L. Sayers

The pervasion of image has so deeply altered our very relationships to ourselves that even men have become objects
if never erotic objects. — Shulamith Firestone

While much of postmodernist analysis should be credited with theoretical imagination, as well as talent for capturing something of the Zeitgeist, this type of analysis nonetheless misses some crucial facts about consumption: that consumption is vitally linked to production; consumption is anchored in concrete relations; and the driving force in consumption is individual interest, as encouraged and often shaped by profit interests. — Richard Swedberg

Marla had always been better at tearing things apart, at least in a physical level (though she liked to think she was good at building more theoretical things, like the complex structure of loyalty, fear, and obligation that kept things running back home). — Tim Pratt

I am now convinced that theoretical physics is actual philosophy. — Max Born

Each of us has had plenty of experience with technology, but few of us have the theoretical or theological tools to make sense of the consequences of our use of technology. — Tim Challies

We have forensic psychiatrists who try to draw a line between those who are sick and those who are criminal, and they bend and twist the truth to make it fit into their world of theoretical models. — Jo Nesbo

Being on the frontier, as I've said, required doing rather than imagining: clearing land, building shelter, obtaining food supplies. Frontiers test ideologies like nothing else. There is no time for the theoretical. That, ultimately, is why America has not been friendly to communism, fascism, or other, more benign forms of utopianism. Idealized concepts have rarely taken firm root in America, and so intellectuals have had to look to Europe for inspiration. People here are too busy making money - an extension, of course, of the frontier ethos, with its emphasis on practical initiative. — Robert D. Kaplan

I say that there is nothing deficient about our current theoretical grasp of mind-brain identities. The problem is only that they are counter-intuitive. — David Papineau

one who gives himself/herself preeminently to the Word, neglecting prayer, will become heady and doctrinal-likely to quarrel about "points", and occupied with theoretical Christianity to the hurt of his soul and irritation of his brethren. On the other hand, one who gives himself/herself much prayer while neglecting the Word is likely to become introspective, mystical, and sometimes fanatical. But he/she who reads the Word of God reverently and humbling seeking to know the will of God, and then gives himself/herself to prayer, confessing and judging what the scriptures have condemned in his ways and words, and thoughts, will have his/her soul drawn out in worship also, and thus grow both in grace and in knowledge, becoming a well rounded follower of Christ. Apart from a knowledge of the Word, prayer will lack exceedingly in intelligence ; for the objective must never precede the subjective, and must not be divorced there from — H. A Ironside

In mysticism, knowledge cannot be separated from a certain way of life which becomes its living manifestation. To acquire mystical knowledge means to undergo a transformation; one could even say that the knowledge is the transformation. Scientific knowledge, on the other hand, can often stay abstract and theoretical. Thus most of today's physicists do not seem to realize the philosophical, cultural and spiritual implications of their theories. — Lois McMaster Bujold

The longing to behold this pre-established harmony [of phenomena and theoretical principles] is the source of the inexhaustible patience and perseverance with which Planck has devoted himself ... The state of mind which enables a man to do work of this kind is akin to that of the religious worshiper or the lover; the daily effort comes from no deliberate intention or program, but straight from the heart. — Albert Einstein

What I remember most clearly was that when I put down a suggestion that seemed to me cogent and reasonable, Einstein did not in the least contest this, but he only said, 'Oh, how ugly.' As soon as an equation seemed to him to be ugly, he really rather lost interest in it and could not understand why somebody else was willing to spend much time on it. He was quite convinced that beauty was a guiding principle in the search for important results in theoretical physics. — Hermann Bondi

The claim that the universe *began* with the big bang has no basis in current physical and cosmological knowledge. The observations confirming the big bang do not rule out the possibility of a prior universe. — Victor J. Stenger

Besides language and music, it [mathematics] is one of the primary manifestations of the free creative power of the human mind, and it is the universal organ for world understanding through theoretical construction. Mathematics must therefore remain an essential element of the knowledge and abilities which we have to teach, of the culture we have to transmit, to the next generation. — Hermann Weyl