I remember that mathematicians were telling me in the 1960s that they would recognize computer science as a mature discipline when it had 1,000 deep algorithms. I think we've probably reached 500.

TeX has found at least one bug in every Pascal compiler it's been run on, I think, and at least two in every C compiler

Programs are meant to be read by humans and only incidentally for computers to execute.

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

The hardest thing is to go to sleep at night, when there are so many urgent things needing to be done. A huge gap exists between what we know is possible with today's machines and what we have so far been able to finish.

A mathematical formula should never be "owned" by anybody! Mathematics belong to God.

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%