Perfecting oneself is as much unlearning as it is learning.

If debugging is the process of removing software bugs, then programming must be the process of putting them in.

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

Programming is one of the most difficult branches of applied mathematics; the poorer mathematicians had better remain pure mathematicians.

The lurking suspicion that something could be simplified is the world's richest source of rewarding challenges.

Computer science is no more about computers than astronomy is about telescopes.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

Simplicity and elegance are unpopular because they require hard work and discipline to achieve and education to be appreciated.

Program testing can be used to show the presence of bugs, but never to show their absence!

Elegance is not a dispensable luxury but a factor that decides between success and failure.

Teaching COBOL ought to be regarded as a criminal act.

The greatest of faults I should say is to be conscious of none.

Without knowledge action is useless and knowledge without action is futile.

There is a law in life: When one door closes to us another one opens.

I tell you what you’ll never really know: all the medical hypothesis that explained my brain will never be as true as these struck leaves letting go.

There's no limit possible to the expansion of each one of us.

I believe education is the great equalizer.

If you aren't having no fun, die, because you're running a worthless program, far as I'm concerned.

You’re never as smart as you think you are when you are winning and never as dumb as you feel when you are losing.

Don't be in too much of a hurry to sell.

Almost without exception, blue refers to the domain of abstraction and immateriality.