The first duty of a man is to think for himself.
Profitability and responsibility must go hand in hand.
每种心理状态都有其存在的目的；要理解它，我们必须询问它在更广泛的行为系统中发挥什么功能。
The only thing that counts is what cannot be explained.
普通人与战士的区别在于，战士将一切视为挑战，而普通人将一切视为祝福或诅咒。