A man is rich in proportion to the number of things which he can afford to let alone. That man is the richest whose pleasures are the cheapest.
The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum.
保持开放心态的麻烦在于，人们总会坚持过来试图往里面塞东西。