Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.

Man is equally incapable of seeing the nothingness from which he emerges and the infinity in which he is engulfed.

Men never do evil so fully and so happily as when they do it for conscience's sake.

One must know oneself, if this does not serve to discover truth, it at least serves as a rule of life and there is nothing better.

People are usually more convinced by reasons they discovered themselves than by those found by others.

Since we cannot know all that there is to be known about anything, we ought to know a little about everything.

The heart has its reasons which reason knows nothing of.

We are generally the better persuaded by the reasons we discover ourselves than by those given to us by others.

We know truth, not only by reason, but also by the heart.