A heavy warning used to be given that pictures are not rigorous; this has never had its bluff called and has permanently frightened its victims into playing for safety.

The infinitely competent can be uncreative.

The first lecture of each new year renews for most people a light stage fright.

A good mathematical joke is better, and better mathematics, than a dozen mediocre papers.

I listen only to Bach, Beethoven or Mozart. Life is too short to waste on other composers.

The surprising thing about this paper is that a man who could write it would.

We come finally, however, to the relation of the ideal theory to real world, or "real" probability. If he is consistent a man of the mathematical school washes his hands of applications. To someone who wants them he would say that the ideal system runs parallel to the usual theory: "If this is what you want, try it: it is not my business to justify application of the system; that can only be done by philosophizing; I am a mathematician". In practice he is apt to say: "try this; if it works that will justify it".