世界是一个充满苦难的地方，唯一逃脱的方法是通过爱。

永远不要低估一个相信共同愿景的团队的力量。

The interest of the behaviorist in man's doings is more than the interest of the spectator—he wants to control man's reactions as physical scientists want to control and manipulate other natural phenomena.

当随机化不可行时，匹配方法可以是一个强大的工具。