Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.

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

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

... regard this body as a machine which, having been made by the hand of God, is incomparably better ordered than any machine that can be devised by man, and contains in itself movements more wonderful than those in any machine. ... it is for all practical purposes impossible for a machine to have enough organs to make it act in all the contingencies of life in the way in which our reason makes us act.

Because reason...is the only thing that makes us men, and distinguishes us from the beasts, I would prefer to believe that it exists, in its entirety, in each of us.

Mathematics is a more powerful instrument of knowledge than any other that has been bequeathed to us by human agency.

Everything is self-evident.