Psychology must be a science of facts, not theories.

Go for a business that any idiot can run – because sooner or later, any idiot probably is going to run it.

每个人心中都有一头野兽，当你给他一把剑或矛并送他上战场时，那头野兽就会苏醒。

释义：担任什么职位，就要安心履行责任，以忠诚之心做好工作，不超越自己的职权范围。