The competent programmer is fully aware of the limited size of his own skull. He therefore approaches his task with full humility, and avoids clever tricks like the plague.

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

Mathematicians are like managers - they want improvement without change.

Simplicity is prerequisite for reliability.

About the use of language: it is impossible to sharpen a pencil with a blunt axe. It is equally vain to try to do it with ten blunt axes instead.

Perfecting oneself is as much unlearning as it is learning.

There should be no such thing as boring mathematics.

If 10 years from now, when you are doing something quick and dirty, you suddenly visualize that I am looking over your shoulders and say to yourself: 'Dijkstra would not have liked this', well that would be enough immortality for me.

Object-oriented programming is an exceptionally bad idea which could only have originated in California.

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

The question of whether a computer can think is no more interesting than the question of whether a submarine can swim.

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

The traditional mathematician recognizes and appreciates mathematical elegance when he sees it. I propose to go one step further, and to consider elegance an essential ingredient of mathematics: if it is clumsy, it is not mathematics.

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

Don't compete with me: firstly, I have more experience, and secondly, I have chosen the weapons.

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