性能的关键在于优雅，而不是大量的特殊情况。
The key to performance is elegance, not battalions of special cases.
The goal of behavior is always the reduction of some drive or need.
让男孩们表现良好的最好方法是让他们对有价值的事情保持兴趣。
行为主义者放在自己面前的规则或衡量标准总是：我能否用"刺激和反应"来描述我所看到的这一行为？
过去是一个参考的地方，而不是居住的地方。
犯罪者是病人，而非罪人。
A person who is too nice an observer of the business of the crowd, like one who is too curious in observing the labor of bees, will often be stung for his curiosity.