To succeed in science, one must doubt; to succeed in life, one must be sure.

The paradox is the seed of truth. This germ just needs a fertile ground to flourish and bear fruit.

Truth is different from error in two respects: it is a little harder to prove and more difficult to admit.

Isn't this the perfect image of the noblest selflessness, and thereby presents an example and a model? It should be inspiring: like them, we are the units of a great social body, like them, we can serve and contemplate death with equanimity, subordinating our individual consciousness to collective consciousness.

Truth is on a curve whose asymptote our spirit follows eternally.

God is the mysterious veil under which we hide our ignorance of the cause.

Civilization is the art of creating useless needs.