The best theory is inspired by practice.

These machines have no common sense; they have not yet learned to "think," and they do exactly as they are told, no more and no less. This fact is the hardest concept to grasp when one first tries to use a computer.

God is a challenge because there is no proof of his existence and therefore the search must continue.

We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%

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

The sun comes up just about as often as it goes down, in the long run, but this doesn't make its motion random.

I have a hunch that the unknown sequences of DNA will decode into copyright notices and patent protections.