The enjoyment of one's tools is an essential ingredient of successful work.

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

Computer programming is an art, because it applies accumulated knowledge to the world, because it requires skill and ingenuity, and especially because it produces objects of beauty. A programmer who subconsciously views himself as an artist will enjoy what he does and will do it better.

Always remember, however, that there’s usually a simpler and better way to do something than the first way that pops into your head.

Beware of bugs in the above code; I have only proved it correct, not tried it.

... the designer of a new system must not only be the implementor and the first large-scale user; the designer should also write the first user manual. ... If I had not participated fully in all these activities, literally hundreds of improvements would never have been made, because I would never have thought of them or perceived why they were important.

Science is what we understand well enough to explain to a computer. Art is everything else we do.