In the spirit of the "Favorite Lyric" thread, what are your Favorite Quotes (and why)

"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn 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."
- Robert A. Heinlein
I like life being full of variety of activity. I think I've done about everything on this list, in some form or another, except solve equations(math is not my strong suite)and balance accounts (H&R Block does that) and die gallantly.