We were not made by Nature to work, or even to play, from eight o'clock in the morning till midnight. We ought to break our days and our marches into two.

The destiny of man is not measured by material computations. When great forces are on the move in the world, we learn we’re spirits—not animals…. There’s something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty.

Watch your thoughts, they become your words.

[There are dangers in] the disposition to hunt down rich men as if they were noxious beasts.

I cannot help reflecting that if my father had been American and my mother British instead of the other way around, I might have gotten here on my own.

A man can wear out a particular part of his mind by continually using and tiring it, just in the same way he can wear out the elbows of his coat.

Never, ever ever ever ever give up.