Robert Anson Heinlein

• 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.
  Time Enough For Love
• 'Oh, "tanstaafl". Means "There ain't no such thing as a free lunch." And isn't,' I added, pointing to a FREE LUNCH sign across room, 'or these drinks would cost half as much. Was reminding her that anything free costs twice as much in the long run or turns out worthless.'
• "To be 'matter of fact' about the world is to blunder into fantasy... and dull fantasy at that, as the real world is strange and wonderful"
• "Anyone who considers protocol unimportant has never dealt with a cat."
• Progress is made by lazy men looking for easier ways to do things. -- Lazarus Long in "Time Enough for Love"
• "Nobody here but us gods" -- Stranger in a Strange Land.
• "Love doesn't subtract -- it multiplies! The more you love, the more you can love."
• "The difference between science and the fuzzy subjects is that science requires reasoning while those other subjects merely require scholarship."
• "Secrecy is the beginning of tyranny." "Always listen to experts. They'll tell you what can't be done, and why. Then do it." -- from the notebooks of Lazarus Long
• "There ain't no such thing as a free lunch!" -- "The Moon is a Harsh Mistress"
• "Anything worth doing is worth overdoing."