The process of preparing programs for a digital computer is especially attractive, not only because it can economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music.

The important thing, once you have enough to eat and a nice house, is what you can do for others, what you can contribute to the enterprise as a whole.

Computers are good at following instructions, but not at reading your mind.

A mathematical formula should never be "owned" by anybody! Mathematics belong to God.

Programs are meant to be read by humans and only incidentally for computers to execute.

The best theory is inspired by practice.

TeX has found at least one bug in every Pascal compiler it's been run on, I think, and at least two in every C compiler