The only valid data for psychology are the reports of trained observers.
心理学唯一有效的数据是受过训练的观察者的报告。
要快乐，我必须拥有我的书和一片天空。
It is human nature to think wisely and act foolishly.
A leader's job is to create more leaders, not more followers.
每个人都是道德的铸造者。
科学不仅仅是寻找答案，更是提出正确的问题。
真相很少是纯粹的，也从来不是简单的。
The more you learn, the more you know, the more you know, the more you forget. The more you forget, the less you know. So why bother to learn?
数学家是能在定理间找到类比的人；更好的数学家能在理论间看到类比；而最优秀的数学家能注意到类比之间的类比。