Inside every large program is a small program struggling to get out.

I couldn't resist the temptation to put in a null reference, simply because it was so easy to implement. This has led to innumerable errors, vulnerabilities, and system crashes, which have probably caused a billion dollars of pain and damage in the last forty years.

The price of reliability is the pursuit of the utmost simplicity. It is a price which the very rich may find hard to pay.

The real value of tests is not that they detect bugs in the code but that they detect inadequacies in the methods, concentration, and skills of those who design and produce the code.

I call it my billion-dollar mistake. It was the invention of the null reference in 1965.

You cannot teach beginners top-down programming, because they don't know which end is up.

The job of formal methods is to elucidate the assumptions upon which formal correctness depends.