There is much pleasure to be gained from useless knowledge.

To teach how to live without certainty and yet without being paralysed by hesitation is perhaps the chief thing that philosophy, in our age, can do for those who study it.

Punctuality is a quality the need of which is bound up with social co-operation.

Affection cannot be created; it can only be liberated.

The true spirit of delight...is to be found in mathematics as surely as in poetry.

Civilized life has altogether grown too tame, and, if it is to be stable, it must provide a harmless outlets for the impulses which our remote ancestors satisfied in hunting.

Man is a credulous animal, and must believe something; in the absence of good grounds for belief, he will be satisfied with bad ones.