What's your favourite quote?

One from my favourite film The Shawshank Redemption, that I remind myself of when I’m having a bad day -

“I guess it comes down to a simple choice, really. Get busy living or get busy dying.”

"A nation's greatness is measured by how it treats its weakest members."
~ Mahatma Ghandi

Actually Mencken is a gold lode of (fairly cynical) but brilliant quotes.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats

Democracy is the theory that the common people know what they want, and deserve to get it good and hard

Puritanism: The haunting fear that someone, somewhere, may be happy.

No one ever went broke underestimating the taste of the American public

The urge to save humanity is almost always only a false-face for the urge to rule it

The older I grow the more I distrust the familiar doctrine that age brings wisdom

The reason that the rich were so rich, Vimes reasoned, was because they managed to spend less money.
Take boots, for example. He earned thirty-eight dollars a month plus allowances. A really good pair of leather boots cost fifty dollars. But an affordable pair of boots, which were sort of OK for a season or two and then leaked like hell when the cardboard gave out, cost about ten dollars. Those were the kind of boots Vimes always bought, and wore until the soles were so thin that he could tell where he was in Ankh-Morpork on a foggy night by the feel of the cobbles.
But the thing was that good boots lasted for years and years. A man who could afford fifty dollars had a pair of boots that’d still be keeping his feet dry in ten years’time, while a poor man who could only afford cheap boots would have spent a hundred dollars on boots in the same time and would still have wet feet.
This was the Captain Samuel Vimes ‘Boots’ theory of socio-economic unfairness. (MA)