There are only two stimulants to one's best efforts: the fear of punishment, and the hope of reward.

There are only two stimulants to one's best efforts: the fear of punishment, and the hope of reward.

一个人最大的努力只有两种刺激物:对惩罚的恐惧和对奖励的希望。

-- John Moulder Wilson 约翰·穆尔德·威尔逊