Now I feel as if I should succeed in doing something in mathematics, although I cannot see why it is so very important. . . The knowledge doesn't make life any sweeter or happier, does it?

Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.

Now, however, I see the folly of attempting to hitch one's wagon to a star with a harness that does not belong to it.

Toleration is the greatest gift of the mind.

The worst thing is to be born sighted but to lack vision.

Your success and happiness lie in you. External conditions are the accidents of life, its outer trappings.

The inferiority of women is man-made.