Descartes Reason Quotes & Sayings

It is to the body alone that we should attribute everything that can be observed in us to oppose our reason. — Rene Descartes

The majority of men is composed of two classes, for neither of which would this be at all a befitting resolution: in the first place, of those who with more than a due confidence in their own powers, are precipitate in their judgments and want the patience requisite for orderly and circumspect thinking; whence it happens, that if men of this class once take the liberty to doubt of their accustomed opinions, and quit the beaten highway, they will never be able to thread the byway that would lead them by a shorter course, and will lose themselves and continue to wander for life; in the second place, of those who, possessed of sufficient sense or modesty to determine that there are others who excel them in the power of discriminating between truth and error, and by whom they may be instructed, ought rather to content themselves with the opinions of such than trust for more correct to their own reason. — Rene Descartes

Another image comes to mind: Nietzsche leaving his hotel in Turin. Seeing a horse and a coachman beating it with a whip, Nietzsche went up to the horse and, before the coachman's very eyes, put his arms around the horse's neck and burst into tears.
That took place in 1889, when Nietzsche, too, had removed himself from the world of people. In other words, it was at the time when his mental illness had just erupted. But for that very reason I feel his gesture has broad implications: Nietzsche was trying to apologize to the horse of Descartes. His lunacy (that is, his final break with mankind) began at the very moment he burst into tears over the horse. — Milan Kundera

Regard this body as a machine which, having been made by the hand of God, is incomparably better ordered than any machine that can be devised by man, and contains in itself movements more wonderful than those in any machine ... it is for all practical purposes impossible for a machine to have enough organs to make it act in all the contingencies of life in the way in which our reason makes us act. — Rene Descartes

Reason is nothing without imagination. — Rene Descartes

As regards the soul, many people thought that its nature cannot easily be investigated, and some have even dared say that human reason shows us that the soul dies with the body and that the contrary view is held by faith alone; however, the Lateran Council, held under Leo X (Session 8), condemns them and explicitly commands Christian philosophers to defeat their arguments and prove the truth to the best of their abilities, and therefore I too have not hesitated to take on this challenge. — Rene Descartes

For, in fine, whether awake or asleep, we ought never to allow ourselves to be persuaded of the truth of anything unless on the evidence of our reason. And it must be noted that I say of our reason, and not of our imagination or of our senses: thus, for example, although we very clearly see the sun, we ought not therefore to determine that it is only of the size which our sense of sight presents; and we may very distinctly imagine the head of a lion joined to the body of a goat, without being therefore shut up to the conclusion that a chimaera exists; — Rene Descartes

Intuition is the undoubting conception of a pure and attentive mind, which arises from the light of reason alone, and is more certain than deduction. — Rene Descartes

And as regards the Soul, although many have judged that its nature could not be easily discovered, and some have even ventured to say that human reason led to the conclusion that it perished with the body, and that the contrary opinion could be held through faith alone; nevertheless, since the Lateran Council, held under Leo X. (in session viii.), condemns these, and expressly enjoins Christian philosophers to refute their arguments, and establish the truth according to their ability, I have ventured to attempt it in this work. 4. — Rene Descartes

Because reason ... is the only thing that makes us men, and distinguishes us from the beasts, I would prefer to believe that it exists, in its entirety, in each of us ... — Rene Descartes

And I have always had an especially great desire to learn to distinguish the true from the false, in order to see my way clearly in my actions, and to go forward with confidence in this life. It is true that, so long as I merely considered the customs of other men, I found hardly anything there about which to be confident, and that I noticed there was about as much diversity as I had previously found among the opinions of philosophers. Thus the greatest profit I derived from this was that, on seeing many things that, although they seem to us very extravagant and ridiculous, do not cease to be commonly accepted and approved among other great peoples, I learned not to believe anything too firmly of which I had been persuaded only by example and custom; and thus I little by little freed myself from many errors that can darken our natural light and render us less able to listen to reason. — Rene Descartes

So blind is the curiosity by which mortals are possessed, that they often conduct their minds along unexplored routes, having no reason to hope for success, but merely being willing to risk the experiment of finding whether the truth they seek lies there. — Rene Descartes

But so soon as I had achieved the entire course of study at the close of which one is usually received into the ranks of the learned, I entirely changed my opinion. For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than the increasing discovery of my own ignorance. - Rene Descartes, Discourse on the Method of Rightly Conducting the Reason and Seeking the Truth in the Sciences, 1637 — Stuart Firestein

[ ... ] the diversity of our opinions, consequently, does not arise from some being endowed with a larger share of reason than others, but solely from this, that we conduct our thoughts along different ways, and do not fix our attention on the same objects. For to be possessed of a vigorous mind is not enough; the prime requisite is rightly to apply it. The greatest minds, as they are capable of the highest excellences, are open likewise to the greatest aberrations; and those who travel very slowly may yet make far greater progress, provided they keep always to the straight road, than those who, while they run, forsake it. — Rene Descartes

Although we very clearly see the sun, we ought not therefore to determine that it is only of the size which our sense of sight presents; and we may very distinctly imagine the head of a lion joined to the body of a goat, without being therefore shut up to the conclusion that a chimaera exists; for it is not a dictate of reason that what we thus see or imagine is in reality existent; but it plainly tells us that all our ideas or notions contain in them some truth. — Rene Descartes

But if one decides to start with Descartes and finish with Aristotle, and to employ an idealist method while shamelessly making use of a reality one has no right to, one brings confusion into the heart of philosophy and makes its cultivation impossible. To make it possible again is the reason why realists are realists and call themselves such. They too follow a method, but they do not lay down beforehand what that method is to be, as though it were a necessary pre-condition for their philosophy. Instead, they find their method in their philosophy. So they never have to ask themselves whether it is legitimate to transform their method into a metaphysics, because their method is that metaphysics, which is fully aware of its proceedings, of its initial positions, and of their implications. — Etienne Gilson

In asking for a relic of Descartes, the chevalier de Terlon was standing at the crossroads of the ancient and modern. He was applying to a modern thinker - the inventor of analytic geometry, no less - a primitive tradition that extends back not only to the institutionalization of Christianity in the fourth century, when Christians first broke into the tombs of saints to gather relics, but farther still, beyond the horizon of recorded history. The request is all the stranger for the fact that the man whose remains were treated in this quasisaintlike way would go down in history as the progenitor of materialism, rationalism, and a whole tradition that looked on such veneration as nonsense. — Russell Shorto

Descartes is rightly regarded as the father of modern philosophy primarily and generally because he helped the faculty of reason to stand on its own feet by teaching men to use their brains
in place whereof the Bible, on the one hand, and Aristotle, on the other, had previously served. — Arthur Schopenhauer

Although my knowledge grows more and more, nevertheless I do not for that reason believe that it can ever be actually infinite, since it can never reach a point so high that it will be unable to attain any greater increase. — Rene Descartes

It is not customary to refer to organisms when we talk about brain
and mind. It has been so obvious that mind arises from the activity
of neurons that only neurons are discussed as if their operation
could be independent from that of the rest of the organism. But as I
investigated disorders of memory, language, and reason in numerous
human beings with brain damage, the idea that mental activity, from
its simplest aspects to its most sublime, requires both brain and body
proper became especially compelling. — Antonio R. Damasio

I revered our theology, and aspired as much as any one to reach heaven: but being given assuredly to understand that the way is not less open to the most ignorant than to the most learned, and that the revealed truths which lead to heaven are above our comprehension, I did not presume to subject them to the impotency of my reason; and I thought that in order competently to undertake their examination, there was need of some special help from heaven, and of being more than man. — Rene Descartes

So it happens that we must ask ourselves, with regard to truth, not for a new criterion for it, which will be better polished than earlier ones, but, peremptorily and seizing it by the lapels, "what is truth as such," and with regard to reality, not what things are or what and how is that which is, but for what reason that X which we call Being is in the Universe, and with regard to knowledge we must not ask for its bases and limits - as Plato, Aristotle Descartes, Kant did - but for something which comes before all this: for what reason we concern ourselves with trying to know. — Jose Ortega Y Gasset

If I find some reason for doubt in each of my beliefs, that will be enough to reject all of them. — Rene Descartes

Moreover, I am aware that most of the irreligious deny the existence of God, and the distinctness of the human soul from the body, for no other reason than because these points, as they allege, have never as yet been demonstrated. — Rene Descartes

The analytical geometry of Descartes and the calculus of Newton and Leibniz have expanded into the marvelous mathematical method-more daring than anything that the history of philosophy records-of Lobachevsky and Riemann, Gauss and Sylvester. Indeed, mathematics, the indispensable tool of the sciences, defying the senses to follow its splendid flights, is demonstrating today, as it never has been demonstrated before, the supremacy of the pure reason. — Nicholas Murray Butler

It is not my design to teach the method that everyone must follow in order to use his reason properly, but only to show the way in which I have tried to use my own. — Rene Descartes

Hence reason also demands that, since our thoughts cannot all be true because we are not wholly perfect, what truth they do possess must inevitably be found in the thoughts we have when awake, rather than in our dreams. — Rene Descartes

Those who reason most powerfully and are the most successful at ordering their thoughts so as to make them clear and intelligible will always be best able to persuade others of what they say, even if they speak in the thickest of dialects — Rene Descartes

It is good to know something of the customs of different people in order to judge more soundly of our own, and so that we might not think that all that which is contrary to our own ways be ridiculous and contrary to reason, as those who have seen nothing have the habit of doing. — Rene Descartes

The system of Descartes ... seemed to give a plausible reason for all those phenomena; and this reason seemed more just, as it is simple and intelligible to all capacities. But in philosophy, a student ought to doubt of the things he fancies he understands too easily, as much as of those he does not understand. — Voltaire

Those in whom the faculty of reason is predominant, and who most skillfully dispose their thoughts with a view to render them clear and intelligible, are always the best able to persuade others of the truth of what they lay down, though they should speak only in the language of Lower Brittany, and be wholly ignorant of the rules of rhetoric; and those whose minds are stored with the most agreeable fancies, and who can give expression to them with the greatest embellishment and harmony, are still the best poets, though unacquainted with the art of poetry. — Rene Descartes