What's your favourite quote about programming?
One quote per answer, and please check for duplicates before posting!
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Keep it simple, stupid!
A programmer is a device for turning caffeine into code.
(Not original to me, but associated with me through appearances on DotNetRocks etc. Lifted from a Usenet sig, I long ago forgot whose, which was no doubt inspired by Paul Erdos.)
Any fool can write code that a computer can understand. Good programmers write code that humans can understand.
Martin Fowler (in his book Refactoring)
Beware of bugs in the above code; I have only proved it correct, not tried it.
— Donald Knuth
A programmer started to cuss
Because getting to sleep was a fuss
As he lay there in bed
Looping 'round in his head
Not quite a quote as such, but I little limerick I've always liked.
Source piercings - bash.org/?845468
My old answer from SO:
If the code and the comments disagree, then both are probably wrong.
Another good website: "Quotes about Tech Writing"
"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled."
-Richard Feynman (Rogers' Commission Report into the Challenger Crash, Appendix F - Personal Observations on Reliability of Shuttle)
"You can't lie to the compiler."
The difficulty of a bug can be measured as the distance, in lines of code, from the cause of a bug to the visible symptom of a bug.