Why do people become firemen, policemen, soldiers, freedom fighters, all activities that cannot be explained in terms of self-interest alone?

不可能只用拿工资的理由，就能完全解释为什么总有人愿意做,消防员，警察，军人和争取自由的斗士？

耶鲁公开课 - 政治哲学导论课程节选

The town, the city, the polis does not provide the fighters with their defensive armor.

城邦无法为所有的战士,提供战斗所需的防具

耶鲁公开课 - 古希腊历史简介课程节选

And as you know, there are fighters among Al Qaeda.

如你所知，基地组织中还有。

普林斯顿公开课 - 国际座谈会课程节选