It used to be the program's purpose to instruct our computers; it became the computer's purpose to execute our programs.

Some consider the puzzles that are created by their omissions as spicy challenges, without which their texts would be boring; others shun clarity lest their work is considered trivial.

Beauty is our business.

If there is one 'scientific' discovery I am proud of, it is the discovery of the habit of writing without publication in mind.

Much of the excitement we get out of our work is that we don't really know what we are doing.

The question of whether computers can think is like the question of whether submarines can swim.

Raise your quality standards as high as you can live with, avoid wasting your time on routine problems, and always try to work as closely as possible at the boundary of your abilities. Do this, because it is the only way of discovering how that boundary should be moved forward.