René Descartes - Nature Quotes
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That the nature of a body does not consist in weight, hardness, color, or other similar properties; but in extension alone. By so doing, we shall perceive that the nature of matter... does not consist in... affects of the senses... but only in the fact that it is a thing possessing extension in length, breadth, and depth.
No more useful inquiry can be proposed than that which seeks to determine the nature and the scope of human knowledge.... This investigation should be undertaken once at least in his life by anyone who has the slightest regard for truth, since in pursuing it the true instruments of knowledge and the whole method of inquiry come to light. But nothing seems to me more futile than the conduct of those who boldly dispute about the secrets of nature... without yet having ever asked even whether human reason is adequate to the solution of these problems.
M. Desargues puts me under obligations on account of the pains that it has pleased him to have in me, in that he shows that he is sorry that I do not wish to study more in geometry, but I have resolved to quit only abstract geometry, that is to say, the consideration of questions which serve only to exercise the mind, and this, in order to study another kind of geometry, which has for its object the explanation of the phenomena of nature... You know that all my physics is nothing else than geometry.