Related:

• Never appeal to a man's "better nature." He may not have one.
  Invoking his self-interest gives you more leverage....
• only to the extent which -- in chains, in dungeo
  in hidden corners, in the cells of philosophers, in the shops of traders -- some men continued to think, only to that extent was humanity able to survive ....
• Paradise for a happy man lies in his own good nature. -- Edward Abbey
• Never frighten a little man. He'll kill you. -- Lazarus Long, from Robert A.
  Heinlein's "Time Enough For Love...
• To get anywhere, or even to live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer.
  -- Robert Heinlein, Time Enough for Love...
• One man's "magic" is another man's "engineering." "Supernatural" is a null word.
  -- Lazarus Long, from Robert A. Heinlein's "Time Enough For Love...
• Rights" is a fictional abstraction. No one has "Rights", neither machines nor flesh-and-blood.
  Persons... have opportunities, not rights, which they use or do not use....
• Autocracy is based on the assumption that one man is wiser than a million men.
  Let's play that one over again, too. Who decides? -- Lazarus Long, from Robert A....
• A reverence for life does not require one to respect nature's obvious mistakes.
  -- Robert A. Heinlei...