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

Philosophy, from the earliest times, has made greater claims, and achieved fewer results, than any other branch of learning.

I am firm; YOU are obstinate; HE is a pig-headed fool.

Among the Tibetans, one wife has many husbands, because men are too poor to support a whole wife.

Inferences of Science and Common Sense differ from those of deductive logic and mathematics in a very important respect, namely, when the premises are true and the reasoning correct, the conclusion is only probable.

Scientific method, although in its more refined forms it may seem complicated, is in essence remarkably simply. It consists in observing such facts as will enable the observer to discover general laws governing facts of the kind in question. The two stages, first of observation, and second of inference to a law, are both essential, and each is susceptible of almost indefinite refinement. (1931)

You may reasonably expect a man to walk a tightrope safely for ten minutes; it would be unreasonable to do so without accident for two hundred years.