Each problem that I solved became a rule, which served afterwards to solve other problems.
Rene DescartesAt last I will devote myself sincerely and without reservation to the general demolition of my opinions.
Rene DescartesEvery man is indeed bound to do what he can to promote the good of others, and a man who is of no use to anyone is strictly worthless.
Rene DescartesAnd as it is the most generous souls who have most gratitude, it is those who have most pride, and who are most base and infirm, who most allow themselves to be carried away by anger and hatred.
Rene DescartesThe senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
Rene DescartesOn the one hand I have a clear and distinct idea of myself, in so far as I am a thinking, non-extended thing; and on the other hand I have a distinct idea of body, in so far a this is simply an extended, non-thinking thing. And, accordingly, it is certain that I am really distinct from my body, and exist without it.
Rene Descartes