Specialization

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A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, write a sonnet, balance accounts, build a wall, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein-

I've read everyone one of his books. I purchased a complete volume set of his books several years ago. They hold a valued place on my bookshelf....

An armed society is a polite society. Manners are good when one may have to back up his acts with his life.
Robert A. Heinlein, Beyond This Horizon