Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.
Every program has (at least) two purposes: the one for which it was written and another for which it wasn't.
A good programming language is a conceptual universe for thinking about programming.
One can't proceed from the informal to the formal by formal means.
If your computer speaks English, it was probably made in Japan.
Adapting old programs to fit new machines usually means adapting new machines to behave like old ones.