Revealing my geek heritage here...
... but here's a few from some sci-fi / roleplay thangs:

"Remember: when you are with a party that contains hobbits and you come across a dragon that you don't have to run faster than the dragon."

And one that is actually profound and should be followed by everyone:
"Love like you will die tomorrow: farm like you will live forever"

And bonus points to whoever can pinpoint the origin of these gems:

"If it can’t be expressed in figures, it is not science; it is opinion."

"A human being should be able to change a diaper, plan an invasion, butcher a hog, con a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects!"

And the absolute, all-time classic:
"Never start a fight... - but ALWAYS end a fight."
(brumguvnor www.twitter.com/brumguvnor, Sat 22 May 2010, 23:09, 4 replies)

"A human being should be able to change a diaper, plan an invasion, butcher a hog [...]. Specialization is for insects!"

Pretty sure that's Robert Heinlein, in "Extract from the diaries of Lazarus Long", if I remember rightly.
(Sir Reginald Slapknackers last slapped his knackers at, Sat 22 May 2010, 23:37, closed)

Yep.
So is 'if it can't be expressed in figures-'

One of my favourites from the same source:
"Always tell her she is beautiful, especially if she is not".
(Sundayturkey has the biggest mug of tea, Sun 23 May 2010, 0:32, closed)

And in the same vein...
One of my favourite film quotes of all time.

"Without love, without anger, without sorrow, breath is just a clock, ticking." - Mary O'Brien, 'Equilibrium'

Feel everything. (Fnarr fnarr.) Otherwise you're just an automated bag full of organs, and what's the point of that, eh?
(Draco Rattus ate all the pies on, Sun 23 May 2010, 7:45, closed)

I spotted the Heinlein quote...
But just wondering, given you obviously have a similar science fiction leaning, where on earth did I read the sage advice: "Never get addicted to anything you may have to do without" or similar. It was in a SF book I read years ago and I can;t remember which one. It's been bugging me for a while now...
( difficultchild, Tue 25 May 2010, 4:01, closed)