Rene Descartes (1596-1650) French philosopher, scientist, mathematician

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I think; therefore I am. [La., Cogito ergo sum] - Rene Descartes

Divide each difficulty into as many parts as is feasible and necessary to resolve it. - Rene Descartes

It is only prudent never to place complete confidence in that by which we have even once been deceived. - Rene Descartes

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. - Rene Descartes

At the time, my grandparents told my mom, 'Lordy, what is Shannen doing?' Now I've calmed down. (On her reputation for bad behaviour.) - Rene Descartes

Of all things, good sense is the most fairly distributed: everyone thinks he is so well supplied with it that even those who are the hardest to satisfy in every other respect never desire more of it than they already have. - Rene Descartes

I am indeed amazed when I consider how weak my mind is and how prone to error. - Rene Descartes

The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge. - Rene Descartes

Good sense is of all things in the world the most equally distributed, for everybody thinks he is so well supplied with it, that even those most difficult to please in all other matters never desire more of it than they already possess. - Rene Descartes