I define UNIX as 30 definitions of regular expressions living under one roof.

Science is what we understand well enough to explain to a computer. Art is everything else we do.

When you write a program, think of it primarily as a work of literature. You're trying to write something that human beings are going to read. Don't think of it primarily as something a computer is going to follow. The more effective you are at making your program readable, the more effective it's going to be: You'll understand it today, you'll understand it next week, and your successors who are going to maintain and modify it will understand it.

Premature optimization is the root of all evil.

The most important thing in the kitchen is the waste paper basket and it needs to be centrally located.

Programming is legitimate and necessary academic endeavour.

It is much more rewarding to do more with less.