Man knows himself only insofar as he knows the world, becoming aware of it if only within himself, and of himself self only within it. Each new subject, well observed, opens up within us a new organ of thought.

Still this planet's soil for noble deeds grants scope abounding.

Man errs, till he has ceased to strive.

He who possesses science and art, Possesses religion as well; He who possesses neither of these, Had better have religion.

He is the happiest man who can see the connection between the end and the beginning of life.

Magic is believing in yourself, if you can do that, you can make anything happen.

I have heard myself accused of being an opponent, an enemy of mathematics, which no one can value more highly than I, for it accomplishes the very thing whose achievement has been denied me.