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

I've never been a good estimator of how long things are going to take.

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

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%

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.

The best theory is inspired by practice.