Reductio ad absurdum, which Euclid loved so much, is one of a mathematicians finest weapons. It is a far finer gambit than any chess play: a chess player may offer the sacrifice of a pawn or even a piece, but a mathematician offers the game.

Money is a strange business. People who haven’t got it aim it strongly. People who have are full of troubles.

This is a four thousand dollar sofa upholstered in Italian silk. It is not just a couch.

Testing is the process of comparing the invisible to the ambiguous, so as to avoid the unthinkable happening to the anonymous.

If we don’t have it, you don’t want it!