Edsger W. Dijkstra

“By claiming that they can contribute to software engineering, the soft scientists make themselves even more ridiculous. (Not less dangerous, alas!) In spite of its name, software engineering requires (cruelly) hard science for its support.”

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

“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.”

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

“Besides a mathematical inclination, an exceptionally good mastery of one's native tongue is the most vital asset of a competent programmer.”

“Your obligation is that of active participation. You should not act as knowledge-absorbing sponges, but as whetstones on which we can all sharpen our wits”

“I mean, 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 question of whether a computer can think is no more interesting than the question of whether a submarine can swim.”

“Progress is possible only if we train ourselves to think about programs without thinking of them as pieces of executable code. ”