Life asks not merely what you can do; it asks how much can you endure and not be spoiled.

War's tragedy is that it uses man's best to do man's worst.

Picture yourself vividly as winning, and that alone will contribute immeasurably to success.

The stars are not so strange as the mind that studies them, analyzes their light, and measures their distance.

I renounce war for its consequences, for the lies it lives on and propagates, for the undying hatred it arouses, for the dictatorships it puts in place of democracy, for the starvation that stalks after it. I renounce war, and never again, directly or indirectly, will I sanction or support another.

It is magnificent to grow old, if one keeps young.

Every year the inventions of science weave more inextricably the web that binds man to man, group to group, nation to nation.