And what will happen is as a result, I experience sadness, because that is what I am thinking about, and sadness-- a painful emotion, not a positive emotion-- leads to further narrow and constrict.

结果就是，我感觉悲伤，因为我一心只想那个，悲伤-,是一种痛苦的情绪，一种消极情绪-,导致进一步的收窄缩紧。

哈佛公开课 - 幸福课课程节选