You will say that man cannot hold property in man.

也许你会说一个人不能把另一个人当财产

耶鲁公开课 - 美国内战与重建课程节选

People who hold constrained vision of human nature, believe that human nature cannot be changed; it's immutable-- we have certain instincts, we have certain inclinations.

认为人性受约束的观点的人，相信人性无法改变;,它是永恒的，我们有一些本能，有一些欲望。

哈佛公开课 - 幸福课课程节选