Rene Descartes

Each problem that I solved became a rule which served afterwards to solve other problems.

—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

One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.

—Rene Descartes

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

—Rene Descartes

Except our own thoughts, there is nothing absolutely in our power.

—Rene Descartes

It is not enough to have a good mind; the main thing is to use it well.

—Rene Descartes

I think; therefore I am.

—Rene Descartes

It is not enough to have a good mind. The main thing is to use it well.

—Rene Descartes

The first precept was never to accept a thing as true until I knew it as such without a single doubt.

—Rene Descartes

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

—Rene Descartes