René Descartes

“ The God of Descartes is not merely the creator of the material universe; he is also the father of all truth in the intellectual world. “The metaphysical truths,” he says, “styled eternal have been established by God, and, like the rest of his creatures, depend entirely upon him. ”

“ Of philosophy I will say nothing, except that when I saw that it had been cultivated for many ages by the most distinguished men, and that yet there is not a single matter within its sphere which is not still in dispute, and nothing, therefore, which is above doubt, I did not presume to anticipate that my success would be greater in it than that of others; and further, when I considered the number of conflicting opinions touching a single matter that may be upheld by learned men, while there can be but one true, I reckoned as well-nigh false all that was only probable. ”

“ The principal object of the Analysis of Descartes is to be found in our notions and judgments. The end of Descartes is to reach Principles or Reasons. In pursuance of this end, he proceeds always from the judgment of the truth of which he is uncertain, and seeks to find whether the other judgments, which the one in question involves, are true, and through these to determine the truth of the proposition from which he starts. Such is the nature of his general procedure. ”

“ Philosophy.—The end of all study, says Descartes, in one of his earliest writings, ought to be to guide the mind to form true and sound judgments on every thing that may be presented to it. [25] The sciences in their totality are but the intelligence of man; and all the details of knowledge have no value save as they strengthen the understanding. The mind is not for the sake of knowledge, but knowledge for the sake of the mind. This is the reassertion of a principle which the middle ages had lost sight of—that knowledge, if it is to have any value, must be intelligence, and not erudition. ”

“ The greatest name between Galileo and Newton is that of Descartes.
René Descartes was born at La Haye in Touraine, 1596, and died at Stockholm in 1650. He did important work in mathematics, physics, anatomy, and philosophy. Was greatest as a philosopher and mathematician. At the age of twenty-one he served as a volunteer under Prince Maurice of Nassau, but spent most of his later life in Holland. His famous Discourse on Method appeared at Leyden in 1637, and his Principia at Amsterdam in 1644; great pains being taken to avoid the condemnation of the Church. ”

“ His fundamental hypothesis relegates to God all forces in their ultimate origin. Hence the world is left open for the free play of mechanics and geometry. The disturbing conditions of will, life and organic forces are eliminated from the problem; he starts with the clear and distinct idea of extension, figured and moved, and thence by mathematical laws he gives a hypothetical explanation of all things. Such explanation of physical phenomena is the main problem of Descartes, and it goes on encroaching upon territories once supposed proper to the mind. ”

“ The activity of the faculties of knowledge is concentrated on objects, and is only manifested in accordance with certain rules. The cognitive power, by being thus limited to a determinate channel, is prevented from being wasted or thrown away in irregular exercise. The activity of the mind is subordinated to the realization of a given end; the mind itself has another rule than its own impetuosity. Descartes, therefore, to reach truth, and for the right conduct of the mind, that is, to prevent it from wasting its powers in capricious activity, instituted a Method. ”

“ Who, then, was the man of first magnitude filling up the gap in scientific history between the death of Galileo and the maturity of Newton? Unknown and mysterious are the laws regulating the appearance of genius. We have passed in review a Pole, a Dane, a German, and an Italian,—the great man is now a Frenchman, René Descartes, born in Touraine, on the 31st of March, 1596. ”

“ And, in fine, our age appeared to me as flourishing, and as fertile in powerful minds as any preceding one. I was thus led to take the liberty of judging of all other men by myself, and of concluding that there was no science in existence that was of such a nature as I had previously been given to believe. ”

“ The certainty of our existence is thus not dependent on the certainty of the existence of God, or on the certainty that God is no deceiver, for, even though deceived, though compelled to think and determine falsely, we think, are conscious; that is, exist. This certainty is the fundamental one; the basis and ground of all knowledge and science; the ultimate point on which Descartes, trusting to the potency of thought, seeks to raise the superstructure of science.
Thus far of the nature of the Cartesian Doubt, and its solution. ”

“ But perhaps I am something more than I suppose myself to be, and it may be that all those perfections which I attribute to God, in some way exist potentially in me, although they do not yet show themselves, and are not reduced to act. Indeed, I am already conscious that my knowledge is being increased [and perfected] by degrees; and I see nothing to prevent it from thus gradually increasing to infinity, nor any reason why, after such increase and perfection, I should not be able thereby to acquire all the other perfections of the Divine nature ”

“ Thus in the perfection of man, as in the nature of God, will and intellect must be united. For thought, will is as necessary as understanding. And innate ideas therefore are mere capacities or tendencies,—possibilities which apart from the will to think may be regarded as nothing at all.
The Cartesian School.—The philosophy of Descartes fought its first battles and gained its first triumphs in the country of his adoption. In his lifetime his views had been taught in Utrecht and Leiden. ”

“ And first as regards the literary significance of Rene Descartes. Professor Dowden places himself in accord with the customary views of criticism in assigning to Descartes a preponderating influence on the literary art of his century. "The spirit of Descartes's work was in harmony with that of his time, and reacted upon literature. He sought for general truths by the light of reason; he made clearness a criterion of truth; he proclaimed man a spirit; he asserted the freedom of the will. The art of the classical period sought also for general truths, and subordinated imagination to reason. ”

“ As to the other sciences, inasmuch as these borrow their principles from philosophy, I judged that no solid superstructures could be reared on foundations so infirm; and neither the honor nor the gain held out by them was sufficient to determine me to their cultivation: for I was not, thank Heaven, in a condition which compelled me to make merchandise of science for the bettering of my fortune ”

“ By his doubt, therefore, did Descartes challenge the propriety, and consummate the ruin of that philosophy known as Scholastic, whose foundations for the last two centuries had been gradually giving way, and chiefly under the influence of independent physical research. Under Scholasticism the human mind had other laws than its own,—thought was subordinated to authority, at first absolutely, then partially, and the whole activity of the mind was limited to the deduction of conclusions from principles which authority furnished. ”

“ Hence it is that Descartes does not seek to discover, in the first instance, the criterion of truth, but only some judgment absolutely certain and indubitable: in other words, he allows the faculties of knowledge to spring into activity and form a product, that is, to affirm their own credibility, before he essays to determine that condition of cognitive activity, the consciousness of which is certainty. ”

“ The force of the universe is swept up and gathered in God, who communicates motion to the parts of extension, and sustains that motion from moment to moment; and in the same way the force of mind has really been concentrated in God. Every moment one expects to find Descartes saying with Hobbes that man’s thought has created God, or with Spinoza and Malebranche that it is God who really thinks in the apparent thought of man. After all, the metaphysical theology of Descartes, however essential in his own eyes, serves chiefly as the ground for constructing his theory of man and of the universe. ”

“ But I allow many particles in each body that are perceived by none of our senses, and this will not perhaps be approved of by those who take the senses for the measure of the knowable. [We greatly wrong human reason, however, as appears to me, if we suppose that it does not go beyond the eye-sight] ; for no one can doubt that there are bodies so small as not to be perceptible by any of our senses, provided he only consider what is each moment added to those bodies that are being increased little by little, and what is taken from those that are diminished in the same way. ”

“ For a sick man is no less Gods Creature then a Man in Health, and therefore ’tis as Absurd to Imagine a Deceitful Nature imposed by God on the One as on the Other; And as a Clock that is made up of Wheels and Weights does no less strictly observe the Laws of its Nature, when it is ill contrived, and tells the hours falsly, as when it answers the Desire of the Artificer in all performances; so if I consider the body of a Man as a meer Machine or Movement, made up and compounded of Bones, Nerves, Muscles, Veins, Blood, and Skin ”

“ Gods great Power comes into my Mind, I cannot but Confess that he may easily cause me to Err even in those things which I Think I perceive most Evidently with my Mind; yet as often as I Consider the Things themselves, which I Judge my self to perceive so Clearly, I am so fully Perswaded by them, that I easily Break out into these Expressions, Let Who can Deceive Me, yet he shall never Cause me Not to Be whilst I think that I Am, or that it shall ever be True, that I never was, Whilst at Present ’tis True that I am, or Perhaps, that Two and Three added make More or Less then Five ”

“ I remark, in the next place, that the mind does not immediately receive the impression from all the parts of the body, but only from the brain, or perhaps even from one small part of it, viz, that in which the common sense (senses communis) is said to be, which as often as it is affected in the same way gives rise to the same perception in the mind, although meanwhile the other parts of the body may be diversely disposed, as is proved by innumerable experiments, which it is unnecessary here to enumerate. ”

“ Then, when he has acquired some skill in discovering the truth in these questions, he should commence to apply himself in earnest to true philosophy, of which the first part is Metaphysics, containing the principles of knowledge, among which is the explication of the principal attributes of God, of the immateriality of the soul, and of all the clear and simple notions that are in us; the second is Physics, in which, after finding the true principles of material things, we examine, in general, how the whole universe has been framed ”

“ In the range of perception, intellect is subjected to the material conditions of sense, memory and imagination; and in infancy, when the will has allowed itself to assent precipitately to the conjunctions presented to it by these material processes, thought has become filled with obscure ideas. In the moral sphere the passions or emotions (which Descartes reduces to the six primitive forms of admiration, love, hatred, desire, joy and sadness) are the perceptions or sentiments of the mind, caused and maintained by some movement of the vital spirits, but specially referring to the mind only. ”

“ In conclusion, I am unwilling here to say anything very specific of the progress which I expect to make for the future in the sciences, or to bind myself to the public by any promise which I am not certain of being able to fulfill; but this only will I say, that I have resolved to devote what time I may still have to live to no other occupation than that of endeavoring to acquire some knowledge of Nature, which shall be of such a kind as to enable us therefrom to deduce rules in medicine of greater certainty than those at present in use ”

“ None of Gods Attributes can proceed from outward objects as from a Pattern, because there is nothing found in God like what is found in External, that is, Corporeal things; Now ’tis manifest that whatever we think of in him differing or unlike what we find in them proceeds not from them, but from a cause of that very diversity in our Thought.
And here I desire to know, how this Philosopher deduces Gods Understanding from outward Things, and yet I can easily explain what Idea I have thereof, by saying, that by the Idea of Gods Understanding I conceive whatever is the Form of any Perception ”

“ For even the minde depends so much on the temper and disposition of the organs of the body, that if it be possible to finde any way of making men in the generall wiser, and more able then formerly they were, I beleeve it ought to be sought in Physick. True it is, that which is now in use contains but few things, whose benefit is very remarkable: But (without any designe of slighting of it) I assure my self, there is none, even of their own profession, but will consent, that whatsoever is known therein, is almost nothing in companion of what remains to be known. ”

“ From what is given intuitively, he essays to reach by demonstration the extreme limits of Philosophy, that is, to construct a system of reasons. It is thus that, though Descartes recommended and practised a return to observation and experiment in the interest of Philosophy, his mode of reaching the highest principles of Science is far from being identical with the Baconian. This and the Cartesian are, in truth, at opposite poles. With Bacon, the highest principles of Science are merely the most extensive generalizations, and form the terminating point of his investigation. ”