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

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

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

If in physics there's something you don't understand, you can always hide behind the uncharted depths of nature. You can always blame God. You didn't make it so complex yourself. But if your program doesn't work, there is no one to hide behind. You cannot hide behind an obstinate nature. If it doesn't work, you've messed up.

Don't blame me for the fact that competent programming, as I view it as an intellectual possibility, will be too difficult for 'the average programmer', you must not fall into the trap of rejecting a surgical technique because it is beyond the capabilities of the barber in his shop around the corner.

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.

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