And here's why. Because this is the No. 1-- equating to selfishness and immorality is the No. 1 cause-- subconsciously mostly, but not only-- No. 1 cause of unhappiness.

这就是为什么，因为这是头号-,将自私等同于不道德是头号原因-,多数是在潜意识里-,导致不快乐的头号原因。

哈佛公开课 - 幸福课课程节选