Because I think that's actually the most satisfying life for us to live, personally, to feel that we are really making a difference somehow and we are not living just for ourselves.

我个人认为,最完满的生活，是那种，你能够感受到真正发挥了作用的生活,而不是完全地为自己而活。

普林斯顿公开课 - 人性课程节选

What is the heart but a spring, ?" or reason but a means of calculating pleasures and pains."

除了跳动，心脏又为何物，除了感觉愉快和痛苦，人为什么而活“

耶鲁公开课 - 政治哲学导论课程节选