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.

— Heinlein, Robert A. Time Enough for Love. New York: Putnam, 1973.