The reasonable man will adjust to the demands of his environment. The unreasonable man expects his environment to adjust to his own needs. Therefore, all progress depends upon the unreasonable man.

This is the true joy in life, the being used for a purpose recognized by yourself as a mighty one.

The more reasonable a student was in mathematics, the more unreasonable she was in the affairs of real life, concerning which fewtrustworthy postulates have yet been ascertained.

What right has any human being to talk of bringing up a child? You do not bring up a tree or a plant. It brings itself up. You have to give it a fair chance by tilling the soil.

Do not try to live forever. You will not succeed.

A man's interest in the world is only an overflow from his interest in himself.

In a battle all you need to make you fight is a little hot blood and the knowledge that it's more dangerous to lose than to win.