Whatever we know without inference is mental.

Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it.

We must be sceptical even of our scepticism.

Half the useful work in the world consists of combating the harmful work.

Love cannot exists as a duty; to tell a child that it ought to love its parents and its brother and sisters is utterly useless, if not worse.

There is something feeble and a little contemptible about a man who cannot face the perils of life without the help of comfortable myths.

An individual human existence should be like a river