What's your favourite quote about programming?
One quote per answer, and please check for duplicates before posting!
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Einstein argued that there must be simplified explanations of nature, because God is not capricious or arbitrary. No such faith comforts the software engineer.
— Fred Brooks, "No Silver Bullet"
From my first programming class (FORTRAN IV):
What is a computer?
It it a box with a little man in it.
This man is blazing fast. He can do millions of instructions per second.
But he is myopic. He's so myopic that he can see only one instruction at a time.
He's also not very smart, he'll attempt to do exactly what you tell him to do.
This has become the base of my philosophy of programming and debugging.
If it wasn't for the last minute, nothing would get done.
—Supposedly from "Murphy's Laws"; see here
Although I can do plenty of things without any pressure (like post answers here), I need a hint of fear to do what I'm supposed to be doing (like my homework).