Moral progress has consisted in the main of protest against cruel customs, and of attempts to enlarge human sympathy.

War grows out of ordinary human nature.

My sad conviction is that people can only agree about what they're not really interested in.

Any pleasure that does no harm to other people is to be valued.

With the introduction of agriculture mankind entered upon a long period of meanness, misery, and madness, from which they are only now being freed by the beneficent operation of the machine.

I do so hate to leave this world.

Insight, untested and unsupported, is an uncertain guarantee of the truth.