René Descartes - Truth Quotes
9 Sourced Quotes
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
Variant translation: The seeker after truth must, once in the course of his life, doubt everything, as far as is possible.
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.
The long chains of simple and easy reasonings by means of which geometers are accustomed to reach the conclusions of their most difficult demonstrations, had led me to imagine that all things, to the knowledge of which man is competent, are mutually connected in the same way, and that there is nothing so far removed from us as to be beyond our reach, or so hidden that we cannot discover it, provided only we abstain from accepting the false for the true, and always preserve in our thoughts the order necessary for the deduction of one truth from another.
We must believe that all the sciences are so interconnected, that it is much easier to study them all together than to isolate one from all the others. If, therefore, anyone wishes to search out the truth of things in serious earnest, he ought not to select one special science; for all the sciences are cojoined with each other and interdependent..