His view is man was happy and good before the invention of society, which society corrupts man and takes away from him his happiness.

他认为在社会形成以前,人类是幸福快乐的,社会使人类堕落并剥夺了人们的幸福

耶鲁公开课 - 古希腊历史简介课程节选

If you are happy, and work on your happiness, you are contributing indirectly to other people's happiness, just like the baby who laughed last time-- made you laugh.

你快乐并努力争取快乐，就是间直接对他人的快乐作出贡献，就像上次大笑的婴儿，把你们逗笑。

哈佛公开课 - 幸福课课程节选