The ultimate good desired is better reached by free trade in ideas [and] the best test of truth is the power of the thought to get itself accepted in the competition of the market.

The root of joy, as of duty, is to put all one's powers towards some great end.

Young man, the secret of my success is that an early age I discovered that I was not God.

I should like to see any kind of man, distinguishable from a gorilla, that some good and even pretty woman could not shape a husband out of.

The very minute a thought is threatened with publicity it seems to shrink towards mediocrity.

The best of a book is not the thought which it contains, but the thought which it suggests; just as the charm of music dwells not in the tones but in the echoes of our hearts.

Life is an end in itself, and the only question as to whether it is worth living is whether you have had enough of it.