Great art is never produced for its own sake. It is too difficult to be worth the effort.

Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.

A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

I'm only a beer teetotaller, not a champagne teetotaller.

You are all fundamentalists with a top dressing of science. That is why you are the stupidest of conservatives and reactionists in politics and the most bigoted of obstructionists in science itself. When it comes to getting a move on you are all of the same opinion: stop it, flog it, hang it, dynamite it, stamp it out.

I occasionally swank a little because people like it; a modest man is such a nuisance.

There is a disease to which plays as well as men become liable with advancing years. In men it is called doting, in plays dating.The more topical the play the more it dates.