Money is a machine for doing quickly and commodiously what would be done, though less quickly and commodiously, without it.

Men and governments must act to the best of their ability. There is no such thing as absolute certainty but there is assurance sufficient for the purposes of human life.

The price paid for intellectual pacification is the sacrifice of the entire moral courage of the human mind.

Among the facts of the universe to be accounted for, it may be said, is Mind; and it is self evident that nothing can have produced Mind but Mind.

Originality is the one thing which unoriginal minds cannot feel the use of.

I confess that I am not charmed with the ideal of life held out by those who think that the normal state of human beings is that of struggling to get on; that the trampling, crushing, elbowing, and treading on each other's heels, which form the existing type of social life, are the most desirable lot of human beings

...there ought to exist the fullest liberty of professing and discussing, as a matter of ethical conviction, any doctrine, however immoral it may be considered.