Quotes & Sayings About Propositions

The truth properly means the sum of all true propositions, what omniscience would assert, the whole ideal system of qualities andrelations which the world has exemplified or will exemplify. The truth is all things seen under the form of eternity. — George Santayana

Liberalism is an attitude rather than a set of dogmas - an attitude that insists upon questioning all plausible and self-evident propositions, seeking not to reject them but to find out what evidence there is to support them rather than their possible alternatives. — Morris Raphael Cohen

Let that which stood in front go behind, let that which was behind advance to the front, let bigots, fools, unclean persons, offer new propositions, let the old propositions be postponed. — Walt Whitman

In the old physics, three times two equals six and two times three equals 6 are reversible propositions. Not in quantum physics. Three times two and two times three are two different matters, distinct and separate propositions. — Paul Auster

. . . absoluteness is a quality of the transcendent that comes to expression in revelation, but not necessarily of the symbols, myths, propositions or doctrines formulated to represent or communicate it. . . . the most precious thing we have to offer each other in interfaith encounters is our honest, unexaggerated and nonpossessive sharing of what we take to be the moments of absoluteness in the particuilar faith traditions in which we live as committed participants. — James W. Fowler

Christian faith is not an irrational leap.Examined objectively, the claims of the Bible are rational propositions well supported by reason and evidence. — Lee Strobel

possibilities of our nature. Instead of reflecting first, we sometimes rush into thoughtless action. Instead of making a reflective, seriously intended, self-committing choice, we sometimes prefer to follow the line of least resistance and to drift lazily along, long-term consequences be damned. The entire environmental movement is based on these propositions. If it is not constituted by study groups, inquiries, data collection, publications, warnings and alarms, consciousness raising, propaganda, education, and political action campaigns designed, at a minimum, to raise public awareness, what is the environmental movement? If it is not concerned — Ronald Bailey

The usual touchstone of whether what someone asserts is mere persuasion or at least a subjective conviction, i.e., firm belief, is betting. Often someone pronounces his propositions with such confident and inflexible defiance that he seems to have entirely laid aside all concern for error. A bet disconcerts him. Sometimes he reveals that he is persuaded enough for one ducat but not for ten. For he would happily bet one, but at ten he suddenly becomes aware of what he had not previously noticed, namely that it is quite possible that he has erred. — Immanuel Kant

The Divine intellect indeed knows infinitely more propositions [than we can ever know]. But with regard to those few which the human intellect does understand, I believe that its knowledge equals the Divine in objective certainty. — Galileo Galilei

Until it is clearly proved that the Universe was created, we may reasonably suppose that it has endured from all eternity. In a case where two propositions are diametrically opposite, the mind believes that which is less incomprehensible: — Christopher Hitchens

The notion that a term can be modified arises from neglect to observe the eternal self-identity of all terms and all logical concepts, which alone form the constituents of propositions.* What is called modification consists merely in having at one time, but not at another, some specific relation to some other specific term; but the term which sometimes has and sometimes has not the relation in question must be unchanged, otherwise it would not be that term which had ceased to have the relation. — Bertrand Russell

And this is also what he takes Christian doctrine, in all its complexity, to be centrally about, that is, teaching an attitude rather than a set of propositions. Call it joyous openness to life. What's not relevant about that? — George Pattison

Besides the propositions which assert Sequence or Co-existence, there are some which assert simple Existence; 36 and others assert Causation, which, subject to the explanations [pg 083] which will follow in the Third Book, must be considered provisionally as a distinct and peculiar kind of assertion. — John Stuart Mill

No advance, no progress can be made beyond these propositions. If anyone wishes to deny their truth or their soundness, the only direction in which he can proceed historically is not forward, but backward toward a time when there was no equality, no rights of the individual, no rule of the people. Those who wish to proceed in that direction cannot lay claim to progress. They are reactionary. Their ideas are not more modern, but more ancient than those of our Revolutionary ancestors. — Calvin Coolidge

Accordingly, we find Euler and D'Alembert devoting their talent and their patience to the establishment of the laws of rotation of the solid bodies. Lagrange has incorporated his own analysis of the problem with his general treatment of mechanics, and since his time M. Poinsot has brought the subject under the power of a more searching analysis than that of the calculus, in which ideas take the place of symbols, and intelligent propositions supersede equations. — James Clerk Maxwell

It makes me hate accepting things that are probable when they are held up before me as infallibly true. I prefer these words which tone down and modify the hastiness of our propositions: "Perhaps, In some sort, Some, They say, I think," and the like. — Michel De Montaigne

Such a principled disregard of ad hominem evidence is a characteristically modern prejudice of professional philosophers. For most Greek and Roman thinkers from Plato to Augustine, theorizing was but one mode of living life philosophically. To Socrates and the countless classical philosophers who tried to follow in his footsteps, the primary point was not to ratify a certain set of propositions (even when the ability to define terms and analyze arguments was a constitutive component of a school's teaching), but rather to explore 'the kind of person, the sort of self' that one could elaborate as a result of taking the quest for wisdom seriously. — James Miller

People have murdered each other, in massive wars and guerilla actions, for many centuries, and still murder each other in the present, over Ideologies and Religions which, stated as propositions, appear neither true nor false to modern logicians- meaningless propositions that look meaningful to the linguistically naive. — Robert Anton Wilson

An example of this is, when the simple propositions are connected by the particle or; as, either A is B or C is D; or by the particle if; as, A is B if C is D. In the former case, the proposition is called disjunctive, in the latter, conditional: the name hypothetical was originally common to both. — John Stuart Mill

Often we agree to shady but attractive propositions and as a result we have sorrow — Sunday Adelaja

These three rules of analytical reading - about terms, propositions, and arguments - can be brought to a head in an eighth rule, which governs the last step in the interpretation of a book's content. More than that, it ties together the first stage of analytical reading (outlining the structure) and the second stage (interpreting the contents). The last step in your attempt to discover what a book is about was the discovery of the major problems that the author tried to solve in the course of his book. (As — Mortimer J. Adler

Dogmatic theological statements are neither logical propositions nor poetic utterances. They are 'shaggy dog' stories; they have a point, but he who tries too hard to get it will miss it. — W. H. Auden

Most propositions and questions, that have been written about philosophical matters, are not false, but senseless ... (They are of the same kind as the question whether the Good is more or less identical than the Beautiful.) — Ludwig Wittgenstein

One does afford oneself the luxury to come into the studio and all day, every day, spend one's life making aesthetic propositions. What an immense luxury. — Anish Kapoor

This spiritual light is not the suggesting of any new truths or propositions not contained in the word of God. This suggesting of new truths or doctrines to the mind, independent of any antecedent revelation of those propositions, either in word or writing, is inspiration; such as the prophets and apostles had, and such as some enthusiasts pretend to. But this spiritual light that I am speaking of, is quite a different thing from inspiration: it reveals no new doctrine, it suggests no new proposition to the mind, it teaches no new thing of God, or Christ, or another world, not taught in the Bible, — Jonathan Edwards

I was trying to show colour, but I realized at the private view that the public were prisoners of a preconceived point of view and that, confronted with all these surfaces of different colours, they responded far more to the inter-relationship of the different propositions, they reconstituted the elements of a decorative polychromy. — Yves Klein

The central ideas of Christianity, an angry God and vicarious atonement, are contrary to every fact in nature, as also to the better aspirations of the human heart; they are, in our present stage of enlightenment, absurd, preposterous, and blasphemous propositions. — Virchand Gandhi

Cooking was not a chore for Tengo. He always used it as a time to think - about everyday problems, about math problems, about his writing, or about metaphysical propositions. He could think in a more orderly fashion while standing in the kitchen and moving his hands than while doing nothing. — Haruki Murakami

To be sure, Darwin's theory of evolution is imperfect. However, the fact that a scientific theory cannot yet render an explanation on every point should not be used as a pretext to thrust an untestable alternative hypothesis grounded in religion into the science classroom or to misrepresent well-established scientific propositions. — Jon Jones

The Syllogism consists of propositions, propositions consist of words, words are symbols of notions. Therefore if the notions themselves (which is the root of the matter) are confused and over-hastily abstracted from the facts, there can be no firmness in the superstructure. Our only hope therefore lies in a true induction. — Francis Bacon

I think we must attack
wherever we meet it
the nonsensical idea that mutually exclusive propositions about God can both be true. — C.S. Lewis

The chief art of learning, as Locke has observed, is to attempt but little at a time. The widest excursions of the mind are made by short flights frequently repeated; the most lofty fabrics of science are formed by the continued accumulation of single propositions. — Samuel Johnson

Beauty is so rare a th
Sing a new song
Real
Music
A busted flush. A pain in the eyebrows. A
Visiting card
- from 15 False Propositions Against God [1958] — Jack Spicer

In obedience to the feeling of reality, we shall insist that, in the analysis of propositions, nothing "unreal" is to be admitted. But, after all, if there is nothing unreal, how, it may be asked, could we admit anything unreal? The reply is that, in dealing with propositions, we are dealing in the first instance with symbols, and if we attribute significance to groups of symbols which have no significance, we shall fall into the error of admitting unrealities, in the only sense in which this is possible, namely, as objects described. — Bertrand Russell

In the Christian religion, though perhaps not in any other, we frequently find a conception of god that is selfcontradictory and therefore corresponds to nothing. That is the conception formed by the following three propositions taken together:
1. God is all-powerful.
2. God is all-benevolent.
3. There is much misery in the world.
A god who was all-powerful but left much misery in the world would not be all-benevolent. An all-benevolent god in a world containing much misery would not be an all-powerful god. A world containing a god who was both all-powerful and all-benevolent would contain no misery.
Here, then, we have a mathematical proof bearing on a common religious doctrine. Anyone who is confident that he frequently comes across misery in the world may conclude with equal confidence that there is no such thing as an all-powerful and all-benevolent god. And this mathematically disposes of official Christianity, as has long been known. — Richard Robinson

Either A is B or C is D," means, "if A is not B, C is D; and if C is not D, A is B." All hypothetical propositions, therefore, though disjunctive in form, are conditional in meaning; and the words hypothetical and conditional may be, as indeed they generally are, used synonymously. — John Stuart Mill

Based upon the tournament results and the formal propositions, four simple suggestions are offered for individual choice: do not be envious of the other player's success; do not be the first to defect; reciprocate both cooperation and defection; and do not be too clever. — Robert Axelrod

In fact, of course, I hold that propositions that contemporary
philosophers would properly count as 'empirical' can be necessary and be known to be such. — Saul Kripke

[The works of Archimedes] are without exception, monuments of mathematical exposition; the gradual revelation of the plan of attack, the masterly ordering of the propositions, the stern elimination of everything not immediately relevant to the purpose, the finish of the whole, are so impressive in their perfection as to create a feeling akin to awe in the mind of the reader. — Thomas Little Heath

The historical fact is that cinema was constituted as such by becoming narrative, by presenting a story, and by rejecting its other possible directions. The approximation which follows is that, from that point, the sequences of images and even each image, a single shot, are assimilated to propositions or rather oral utterances [ ... ]. — Gilles Deleuze

Americans no longer talk to each other, they entertain each other. They do not exchange ideas, they exchange images. They do not argue with propositions; they argue with good looks, celebrities and comercials. — Neil Postman

You cannot begin to deal with terms, propositions, and arguments - the elements of thought - until you can penetrate beneath the surface of language. — Mortimer J. Adler

A crucial point here is that understanding is not only a matter of reflection, using finitary propositions, on some preexistent, already determinate experience. Rather, understanding is the way we "have a world," the way we experience our world as a comprehensible reality. Such understanding, therefore, involves our whole being - our bodily capacities and skills, our values, our moods and attitudes, our entire cultural tradition, the way in which we are bound up with a linguistic community, our aesthetic sensibilities, and so forth. I short, our understanding is our mode of "being in the world." It is the way we are meaningfully situated in our world through our bodily interactions, our cultural institutions , our linguistic tradition, and our historical context. Our more abstract reflective acts of understanding (which may involve grasping of finitary propositions) are simply an extension of our understanding in this more basic sense of "having a world. — Mark Johnson

Even now, as she walks down the long corridor, the crude jokes, the lewd propositions, the stinging remarks, the jeering catcalls and
the leering laughter echo in her ears. She can hear all the vile names she had been called post scandal. Hateful, ugly names that don't stop resonating in her head even after so many years. They never would. Some memories are etched too deeply to be erased completely. — Chandana Roy

Ronald Reagan in foreign affairs, I think, was someone who had certain, very general ideas, general propositions by which he lives: To combat communism, to build up the American military power to assure our national security against any conceivable threat. — Robert Dallek

Don't be a cynic, and bewail and bemoan. Omit the negative propositions. Don't waste yourself in rejection, nor bark against the bad, but chant the beauty of the good. Set down nothing that will help somebody. — Ralph Waldo Emerson

It is not a very pleasing spectacle to observe uncultivated ignorance and crudity of mind, with neither form nor taste, without the capacity to concentrate its thoughts on an abstract proposition, still less on a connected statement of such propositions, confidently proclaiming itself to be intellectual freedom and — Georg Wilhelm Friedrich Hegel

It has often been argued that absolute scepticism is self-contradictory; but this is a mistake: and even if it were not so, it would be no argument against the absolute sceptic, inasmuch as he does not admit that no contradictory propositions are true. Indeed, it would be impossible to move such a man, for his scepticism consists in considering every argument and never deciding upon its validity; he would, therefore, act in this way in reference to the arguments brought against him. — Charles Sanders Peirce

This is not to say that the deepest concerns of the faithful, whether moderate or extreme, are trivial or misguided. There is no denying that most of us have emotional and spiritual needs that are now addressed - however obliquely and at a terrible price - by mainstream religion. And these are needs that a mere understanding of our world, scientific or otherwise, will never fulfill. There is clearly a sacred dimension to our existence, and coming to terms with it could well be the highest purpose of human life. But we will find that it requires no faith in untestable propositions - Jesus was born of a virgin; the Koran is the word of God - for us to do this. — Sam Harris

A theorem is a proposition which is a strict logical consequence of certain definitions and other propositions — Anatol Rapoport

In today's world, working for yourself is actually the safer route, and working for a corporation has become the riskier propositions. — Paul Zane Pilzer

Unlike determinism, fatalism does not proceed by contemplating the causal mechanics of the universe-the implications for human freedom of Newtonian physics or thermodynamics or quantum mechanics. Instead, the fatalist argues that his doctrine can be established by mere reflection on the logic of propositions about the future. In simplified form, a version of the argument might run as follows: If I fire my handgun, one second from now its barrel will be hot; if I do not fire, one second from now the barrel will not be hot; but the proposition one second from now the barrel will be hot is right now either true or false. If the proposition is true, then it is the case that I will fire the gun; if it's false, then it is the case that I won't. Either way, it's the state of affairs in the future that dictates what I will or won't do now. — David Foster Wallace

The movement called Christianity cannot be understood apart from the Jewish concept of shalom. The Christian gospel does not call people to give their mental assent to a certain list of correct propositions, nor does it provide its adherents with a password that will gain them disembodied bliss when they die and the pleasure of confidently awaiting their escape until then. Shalom is a way of being in the world. The Christian gospel invites us to partake in shalom, to embody shalom, and to anticipate its full realization in the coming kingdom of God. — David Dark

Some of my cousins who had the great advantage of University education used to tease me with arguments to prove that nothing has any existence except what we think of it. The whole creation is but a dream; all phenomena are imaginary. You create your own universe as you go along. The stronger your imagination, the more variegated your universe. When you leave off dreaming, the universe ceases to exist. These amusing mental acrobatics are all right to play with. They are perfectly harmless and perfectly useless. I warn my younger readers only to treat them as a game. The metaphysicians will have the last word and defy you to disprove their absurd propositions. — Winston S. Churchill

She [Nana] listened to his [Steiner's] propositions, turning them down every time with a shake of the head and that provocative laughter which is peculiar to full-bodied blondes. — Emile Zola

The progressive historical role of capitalism may be summed up in two brief propositions: increase in the productive forces of social labour, and the socialisation of that labour. But both these facts manifest themselves in extremely diverse processes in different branches of the national economy. — Vladimir Lenin

Nothing at first can appear more difficult to believe than that the more complex organs and instincts should have been perfected, not by means superior to, though analogous with, human reason, but by the accumulation of innumerable slight variations, each good for the individual possessor. Nevertheless, this difficulty, though appearing to our imagination insuperably great, cannot be considered real if we admit the following propositions, namely, - that gradations in the perfection of any organ or instinct, which we may consider, either do now exist or could have existed, each good of its kind, - that all organs and instincts are, in ever so slight a degree, variable, - and, lastly, that there is a struggle for existence leading to the preservation of each profitable deviation of structure or instinct. The truth of these propositions cannot, I think, be disputed. — Charles Darwin

Among the minor, yet striking characteristics of mathematics, may be mentioned the fleshless and skeletal build of its propositions; the peculiar difficulty, complication, and stress of its reasonings; the perfect exactitude of its results; their broad universality; their practical infallibility. — Charles Sanders Peirce

Conceive the condition of the human mind if all propositions whatsoever were self-evident except one, which was to become self-evident at the close of a summer's day, but in the meantime might be the subject of question, of hypothesis, of debate. Art and philosophy, literature and science, would fasten like bees on that one proposition which had the honey of probability in it, and be the more eager because their enjoyment would end with sunset. Our impulses, our spiritual activities, no more adjust themselves to the idea of their future nullity, than the beating of our heart, or the irritability of our muscles. — George Eliot

All philosophic propositions, every attempt to think including all acts of oral or written articulation of an argument and metaphorically expressed ideas, are subject to the dynamics and limitations of human language. The spoken thought is only part of any philosophic message; the other part is unsaid because it is unsayable. The crux of any philosophic proposition reverberates in the echo of silence, the thought that lies in-between the lines. — Kilroy J. Oldster

It is a mistake to believe that science consists in nothing but conclusively proved propositions, and it is unjust to demand that it should. It is a demand made by those who feel a craving for authority in some form to replace the religious catechism by something else, even a scientific one. — Sigmund Freud

Reason is the power or capacity whereby we see or detect logical relationships among propositions. — Alvin Plantinga

But all propositions of logic say the same thing. That is, nothing. — Ludwig Wittgenstein

Because two propositions can be true at once," he said. "Because the world is imperfect. Because we are imperfect. Because sometimes we're called upon to do terrible things. And because we define ourselves in dying, which is," he indicated by motioning with his head toward the arena, "what this is. Give us at least that. — Mark Helprin

It means nothing to be open to a proposition we don't understand. — Carl Sagan

Our present work sets forth mathematical principles of philosophy. For the basic problem of philosophy seems to be to discover the forces of nature from the phenomena of motions and then to demonstrate the other phenomena from these forces. It is to these ends that the general propositions in books 1 and 2 are directed, while in book 3 our explanation of the system of the world illustrates these propositions. — Isaac Newton

..the poem is made of sequences in which images, figures of speech and rhythm are undivided. One needs to enter this 'undivision'", and what it does, the proposition it issues, in both senses of the word, logical and erotic: "Let us call a sentence a proposition. A poem makes propositions — Michel Deguy

The things that fascinate me the most about mathematics are logical thought and the great importance attached to the correctness of propositions. Every step made during calculations is conclusive and mathematicians don't like to make false statements. This is the reason why people from this particular domain contemplate longer before they respond to questions. Recently I read a sentence in a book which summarizes all this fascinating stuff to me succinctly: 'Mathematics is the purest form of thought. — Barbara Meier

A priori Logical propositions are such as can be known a priori without study of the actual world. — Bertrand Russell

A long list of propositions does not necessarily make a coherent argument — Andrew Pettegree

The only logical meaning of necessity seems to be derived from implication. A proposition is more or less necessary according as the class of propositions for which it is a premiss is greater or smaller.* In this sense the propositions of logic have the greatest necessity, and those of geometry have a high degree of necessity. But this sense of necessity yields no valid argument from our inability to imagine holes in space to the conclusion that there cannot really be any space at all except in our imaginations. — Bertrand Russell

One of the most freeing discoveries these past few years in my relationship with God is discovering that God is not a belief system or a fixed set of theological propositions. — Jim Palmer

It is thinkable to think that A is not-A; to reverse this is but to revert to the normal. Yet by forcing the brain to accept propositions of which one set is absurdity, the other truism, a new function of the brain is established. Vague and mysterious and all indefinite are the contents of this new consciousness; yet they are somehow vital. Unreason becomes experience. This lifts the leaden-footed Soul to the Experience of THAT of which Reason is the blasphemy. But without that Experience these words are the Lies of a Looby. — Aleister Crowley

I hate facts. I always say the chief end of man is to form general propositions - adding that no general proposition is worth a damn. — Oliver Wendell Holmes, Sr.

Not that the propositions of geometry are only approximately true, but that they remain absolutely true in regard to that Euclidean space which has been so long regarded as being the physical space of our experience. — Arthur Cayley

I doubt not, but from self-evident Propositions, by necessary Consequences, as incontestable as those in Mathematics, the measures of right and wrong might be made out. — John Locke

My propositions serve as elucidations in the following way: anyone who understands me eventually recognizes them as nonsensical, when he has used them
as steps
to climb up beyond them. (He must, so to speak, throw away the ladder after he has climbed up it.) He must transcend these propositions, and then he will see the whole world aright. — Ludwig Wittgenstein

Many life-affirming questions lead to an endless spool of disconcerting propositions and contradictory conclusions, and even more troubling, some queries prove unanswerable. — Kilroy J. Oldster

I do not put much stock in "believing in God." The grammar of "belief" invites a far too rationalistic account of what it means to be a Christian. "Belief" implies propositions about which you get to make up your mind before you know the work they are meant to do. — Stanley Hauerwas

This whole Psalm offers itself to be drawn into these two opposite propositions: a godly man is blessed, a wicked man is miserable; which seem to stand as two challenges, made by the prophet: one, that he will maintain a godly man against all comers, to be the only Jason for winning the golden fleece of blessedness; the other, that albeit the ungodly make a show in the world of being happy, yet they of all men are most miserable. - Sir Richard Baker, 1640 — Charles Haddon Spurgeon

It is a good thing to proceed in order and to establish propositions. This is the way to gain ground and to progress with certainty. — Gottfried Leibniz

Propositions are to stories (and to reality) as powdered milk is to what comes from the udder. Propositions are dried-out stories with much of the vitality removed. They may say something technically true, just as powdered milk is still technically a form of milk, but they do not win our hearts and are not enough on which to nourish a life. — Daniel Tayler

God is omnipotent; God is wholly good; and yet evil exists. There seems to be some contradiction between these three propositions, so that if any two of them were true the third would be false. But at the same time all three are essential parts of most theological positions: the theologian it seems, at once must adhere and cannot consistently adhere to all three. — J. L. Mackie

In adaptive terms, belief has been extraordinarily useful. It is, after all, by believing various propositions about the world that we predict events and consider the likely consequences of our actions. Beliefs are principles of action: whatever they may be at the level of the brain, they are processes by which our understanding (and misunderstanding) of the world is represented and made available to guide our behavior. — Sam Harris

Philosophy, certainly, is some account of truths the fragments and very insignificant parts of which man will practice in this workshop; truths infinite and in harmony with infinity, in respect to which the very objects and ends of the so-called practical philosopher will be mere propositions, like the rest. — Henry David Thoreau

It was a needed instrument to spread abroad the truth of a new gospel to woman, and I could not withhold my hand to stay the work I had begun. I saw not the end from the beginning and dreamed where to my propositions to society would lead me, — Amelia Bloomer

The danger of religious faith is that it allows otherwise normal human beings to reap the fruits of madness and consider them holy. Because each new generation of children is taught that religious propositions need not be justified in the way that all others must, civilization is still being besieged by the armies of the preposterous. We are, even now, killing ourselves over ancient literature. Who would have thought something so tragically absurd could be possible? — Sam Harris

One is our tendency to give higher credences to propositions that we want to be true. This can show up at a very personal level, as what's known as self-serving bias: — Sean Carroll

Ridicule is the only weapon which can be used against unintelligible propositions. — Thomas Jefferson

Some philosophers fail to distinguish propositions from judgements; ... But in the real world it is more important that a proposition be interesting than that it be true. The importance of truth is that it adds to interest. — Alfred North Whitehead

The validity of mathematical propositions is independent of the actual world-the world of existing subject-matters-is logically prior to it, and would remain unaffected were it to vanish from being. Mathematical propositions, if true, are eternal verities. — Cassius Jackson Keyser

I cannot forbear adding to these reasonings an observation, which may, perhaps, be found of some importance. In every system of morality, which I have hitherto met with, I have always remark'd, that the author proceeds for some time in the ordinary way of reasoning, and establishes the being of a God, or makes observations concerning human affairs; when of a sudden I am surpriz'd to find, that instead of the usual copulations of propositions, is, and is not, I meet with no proposition that is not connected with an ought, or an ought not. This change is imperceptible; but is, however, of the last consequence. — David Hume

Take note, theologians, that in your desire to make matters of faith out of propositions relating to the fixity of sun and earth you run the risk of eventually having to condemn as heretics those who would declare the earth to stand still and the sun to change position-eventually, I say, at such a time as it might be physically or logically proved that the earth moves and the sun stands still. — Galileo Galilei

Propositions are true or false. Images are not. — Gene Edward Veith Jr.

Don't be a cynic and disconsolate preacher. Don't bewail and moan. Omit the negative propositions. Challenge us with incessant affirmatives. — Ralph Waldo Emerson

His conclusions were as infallible as so many propositions of Euclid. So startling would his results appear to the uninitiated that until they learned the processes by which he had arrived at them they might well consider him as a necromancer. — Arthur Conan Doyle

We can no longer assert any single proposition, unless we guard ourselves by enumerating countless conditions which must be assumed. — Aleister Crowley

I am arguing that faith as such, faith as an alleged method of acquiring knowledge, is totally invalid and as a consequence, all propositions of faith, because they lack rational demonstration, must conflict with reason. — George H. Smith

Give unqualified assent to no propositions but those the truth of which is so clear and distinct that they cannot be doubted. The enunciation of this first great commandment of science consecrated doubt. — Thomas Huxley

Mathematics is purely hypothetical: it produces nothing but conditional propositions. — Charles Sanders Peirce