If all the economists were laid end to end, they'd never reach a conclusion.

You are all fundamentalists with a top dressing of science. That is why you are the stupidest of conservatives and reactionists in politics and the most bigoted of obstructionists in science itself. When it comes to getting a move on you are all of the same opinion: stop it, flog it, hang it, dynamite it, stamp it out.

Why, except as a means of livelihood, a man should desire to act on the stage when he has the whole world to act in, is not clear to me.

I was a freethinker before I knew how to think.

You can easily find people who are ten times as rich at sixty as they were at twenty but not one of them will tell you that they are ten times as happy

It is easy - terribly easy - to shake a man's faith in himself. To take advantage of that to break a man's spirit is devil's work.

Activity is the only road to knowledge.