Incorrect documentation is often worse than no documentation.

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.

Simplicity is the ultimate sophistication.

The crazier the theory, the more likely it is to be correct.

Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's law.