What's your favourite quote about programming?
One quote per answer, and please check for duplicates before posting!
There are 10 kinds of people in the world — those who understand binary and those who don't.
Keep it simple, stupid!
Should array indices start at 0 or 1? My compromise of 0.5 was rejected without, I thought, proper consideration.
— Stan Kelly-Bootle
A clever person solves a problem. A wise person avoids it.
— Albert Einstein
Being a good software engineer is 3% talent, 97% not being distracted by the internet.
— Unknown, appropriated
A computer is a stupid machine with the ability to do incredibly smart things, while computer programmers are smart people with the ability to do incredibly stupid things. They are, in short, a perfect match.
— Bill Bryson
If you want to set off and go develop some grand new thing, you don't need millions of dollars of capitalization. You need enough pizza and Diet Coke to stick in your refrigerator, a cheap PC to work on and the dedication to go through with it.
— John Carmack
All problems in computer science can be solved by another level of indirection... Except for the problem of too many layers of indirection.
— David Wheeler
What's the simplest thing that could possibly work?
— Ward Cunningham
Testing can only prove the presence of bugs, not their absence.
— Edsger W. Dijkstra
There are two major products that come out of Berkeley: LSD and UNIX. We don't believe this to be a coincidence.
Jeremy S. Anderson
I don't care if it works on your machine! We are not shipping your machine!
-- Vidiu Platon (whoever that is)
When all you have is a hammer, everything starts to look like a nail
Good code is its own best documentation. As you're about to add a comment, ask yourself, 'How can I improve the code so that this comment isn't needed?' Improve the code and then document it to make it even clearer.
There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies.
— C.A.R. Hoare
A computer lets you make more mistakes faster than any invention in human history—with the possible exceptions of handguns and tequila.
— Mitch Ratcliffe
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.)
There, it should work now.
— All programmers
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
You wanted a banana but what you got was a gorilla holding the banana and the entire jungle.
— Joe Armstrong on object-oriented programming
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"
Any sufficiently advanced technology is indistinguishable from magic.
-- Arthur C. Clarke
To understand recursion, you first need to understand recursion
"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."
Software is like sex: it's better when it's free.
— Linus Torvalds
On the seventh day, God said, "Ship it! We'll release patches later."
— Josh Flachsbart
The real question is not whether machines think but whether men do.
— B. F. Skinner
Related more to AI than to simple programming, but I still like it.
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.