His two opposing ideas involved seeking happiness from material things, and knowing that material things only brought unhappiness.

VOA: special.2010.11.21

Now happiness and unhappiness,or happiness and neurosis, psychosis and depression,are interconnected,of course.

幸福与忧愁，快乐与紧张，精神病与抑郁，都有很大的内在联系。

哈佛公开课 - 幸福课课程节选

Second reason for having positive psychology's field of study and focusing on what works and focusing on research in happiness,relationships and wellbeing is because happiness does not spontaneously rise when take unhappiness away.

第二个研究积极心理学的原因,研究可行的事和,研究快乐，人际关系，幸福的原因,是因为幸福不会因为驱除了忧愁,而自动增长。

哈佛公开课 - 幸福课课程节选