Unix has retarded OS research by 10 years and linux has retarded it by 20.

One of my most productive days was throwing away 1000 lines of code.

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

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 key to performance is elegance, not battalions of special cases.