Being happy, in other words, is also a moral state in the sense of actually contributing to other people's wellbeing.

感受快乐，换言之，也是一种道德状态,对他人的幸福作出贡献。

哈佛公开课 - 幸福课课程节选

But the question isn't really, is there something you could do to a human being ? so that he'd be happy, or at least enjoying himself, forever?

但问题并非，是否有办法改变人类,让他快乐或起码永远享受自己？

耶鲁公开课 - 死亡课程节选