When working on a problem, think only how to solve it. If the solution is not simple and has no inner beauty such as art, it is wrong.
The purpose of software engineering is to control complexity, not to create it.
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's law.
The crazier the theory, the more likely it is to be correct.
The key to performance is elegance, not battalions of special cases.