APL is a mistake, carried through to perfection. It is the language of the future for the programming techniques of the past: it creates a new generation of coding bums.

I mentioned the non-competitive spirit explicitly, because these days, excellence is a fashionable concept. But excellence is a competitive notion, and that is not what we are heading for: we are heading for perfection.

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.

The ability of discerning high quality unavoidably implies the ability of identifying shortcomings.

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

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

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

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

There should be no such thing as boring mathematics.

Mathematicians are like managers - they want improvement without change.

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.

Teaching to unsuspecting youngsters the effective use of formal methods is one of the joys of life because it is so extremely rewarding.

Why has elegance found so little following? That is the reality of it. Elegance has the disadvantage, if that's what it is, that hard work is needed to achieve it and a good education to appreciate it.

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

Perfecting oneself is as much unlearning as it is learning.

The students that, like the wild animal being prepared for its tricks in the circus called "life", expects only training as sketched above, will be severely disappointed: by his standards he will learn next to nothing.

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.

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.

APL is a mistake, carried through to perfection. It is the language of the future for the programming techniques of the past: it creates a new generation of coding bums.

The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offense.

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

Aim for brevity while avoiding jargon.

It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration.

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.

Many mathematicians derive part of their self-esteem by feeling themselves the proud heirs of a long tradition of rational thinking; I am afraid they idealize their cultural ancestors.

The students that, like the wild animal being prepared for its tricks in the circus called 'life', expects only training as sketched above, will be severely disappointed: by his standards he will learn next to nothing.

Mathematicians are like managers they want improvement without change.

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

If we wish to count lines of code, we should not regard them as lines produced but as lines spent.

The future belongs to those who see possibilities before they become obvious.

It looks like the future's really bright.

I am tomorrow, or some future day, what I establish today. I am today what I established yesterday or some previous day.

The best prophet of the future is the past.

Some of the best lessons we ever learn are learned from past mistakes. The error of the past is the wisdom and success of the future.

Race horses are like golfers, you're never sure how they're going to come out of the stalls. It's just - hopefully the horses come out of the race all right, just fit and ready to go again in the near future, but 3rd was good. It's paid for its hay.

Philosophy finds it an easy matter to vanquish past and future evils, but the present are commonly too hard for it.

In 1975 I decided that there was no future in flying (airline jobs were impossible to get, and who wants a job where you are judged only by seniority?) and headed off to grad school.

America is false to the past, false to the present, and solemnly binds herself to be false to the future.

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment.

And while the U.S. can never be 100 percent safe from a future strike, our government is working around the clock on measures to protect the American people.

No one is more important to the future of our state than our teachers.

We believe that peace is not just signed papers, but rather a contract between generations for the building of a more promising and less threatening future.

What I'm suggesting to you is that this could be a renaissance. We may be on the cusp of a future which could provide a tremendous leap forward for humanity.

Yet, our achievements also mask many continuing failings and seem to expose more future dangers.

I mean that at least 80% of the Russian people feel destitute. It's the people who had their past and future taken from them - they don't get paid - many of them face a wall. They have nowhere to go.

Infuse your life with action. Don't wait for it to happen. Make it happen. Make your own future. Make your own hope. Make your own love. And whatever your beliefs, honor your creator, not by passively waiting for grace to come down from upon high, but by doing what you can to make grace happen... yourself, right now, right down here on Earth.

It also allows you to look as though you're not particularly from the present, future or past, either.