Experience does by no means automatically leads to wisdom and understanding.

Thanks to the greatly improved possibility of communication, we overrate its importance. Even stronger, we underrate the importance of isolation.

APL is a mistake, carried through to perfection.

I now have had my foggy crystal ball for quite a long time. Its predictions are invariably gloomy and usually correct, but I am quite used to that and they won't keep me from giving you a few suggestions, even if it is merely an exercise in futility whose only effect is to make you feel guilty.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

Progress is possible only if we train ourselves to think about programs without thinking of them as pieces of executable code.

I don't need to waste my time with a computer just because I am a computer scientist.