I thought that sooner or later one thing was sure to happen: The first real test once he was through school would ruin him.

VOA: special.2010.03.27

But if one pursues it further than one should, it is absolute ruin."

但倘若过分沉溺其中，那他必将走向毁灭“

耶鲁公开课 - 公正课程节选

Remember, even one bad man can ruin a polis.

记得吧,一个恶人就能毁了整个城邦

耶鲁公开课 - 古希腊历史简介课程节选