Why should I act in such a way if I have no expectation or reasonable expectation that those around me will reciprocate?

如果我对别人的报答,没有期望或合理的期望,我为什么要这样做？

耶鲁公开课 - 政治哲学导论课程节选

How do I give up my right to do whatever is in my power to secure my person or my possessions, when I have no expectation, you might say, ? that others around me are prepared to do so as well?

我怎么能在我不期望,身边的人会这样做的时候，放弃我保护自身和财产安全，不受侵害的权利？

耶鲁公开课 - 政治哲学导论课程节选