A carelessly planned project takes three times longer to complete than expected. A carefully planned project takes only twice as long.
A verbal contract isn't worth the paper it's written on.
Nothing will be attempted if all possible objections must first be overcome.
There's something wrong if you're always right.
You can't win. You can't break even. You can't even quit the game.
Investment in reliability will increase until it exceeds the probable cost of errors -- or someone insists on getting some useful work done.
All programs contain errors until proved otherwise, which is impossible.
Undetectable errors have infinite variety; detectable errors by definition are limited.
If nobody uses it, there's a reason.
In a bureaucratic system, useless work drives out useful work.