If a Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world too full.

What hunger is in relation to food, zest is in relation to life.

The opposition of instinct and reason is mainly illusory. Instinct, intuition, or insight is what first leads to the beliefs which subsequent reason confirms or confutes; but the confirmation, where it is possible, consists, in the last analysis, of agreement with other beliefs no less instinctive. Reason is a harmonizing, controlling force rather than a creative one. Even in the most purely logical realms, it is insight that first arrives at what is new.

You are a wicked motorcar, and I shall not give you any more petrol until you go.

Every great idea starts out as a blasphemy.

Morally, a philosopher who uses his professional competence for anything except a disinterested search for truth is guilty of a kind of treachery.

Every housemaid expects at least once a week as much excitement as would have lasted a Jane Austen heroine throughout a whole novel.