Christofer C. Bell wrote:
"Build a man a fire and he will be warm for the rest of the night. Set a man on fire and he will be warm for the rest of his life." -- Unknown
I don't know if he also borrowed it from somewhere, but I usually see that quote attributed to Terry Pratchett.
I'm also fond of the following quote, as I think it really points to the true advantages of FOSS. I keep a copy in the machine room:
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." --Douglas Adams