And there is a self-enforcing loop between the two, where helping others helps ourselves; and helping ourselves, in turn, helps others.

两者间有自我实施的循环，帮助他人就是帮助自己;,帮助自己继而帮助他人。

哈佛公开课 - 幸福课课程节选

It works the other way as well, because helping others also helps ourselves.

别人快乐你也快乐，因为帮助他人也是帮助自己。

哈佛公开课 - 幸福课课程节选