"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."

And also:

"Everything in excess! To enjoy the flavor of life, take big bites. Moderation is for monks."

Lazarus Long, from Heinlein's "Time Enough for Love"