Now I say this not so much to depress the hell out of you, but partly to warn you, and to make it clear that I believe that it's a skill.

我说这些不是想吓坏你们，只是，一，警告你们一下，二，说清楚，我相信这只是一种技能。

耶鲁公开课 - 死亡课程节选