The general story of why we can't in general is because there's no surprise, there's no mock aggression, and also there may be a general deadening of self-stimulation.

为什么大部分人不能胳肢自己,是因为它在我们意料之内，没有打闹的侵略性，通常这种引自己笑的念头都会嘎然而止。

耶鲁公开课 - 心理学导论课程节选

And here's why. Because this is the No. 1-- equating to selfishness and immorality is the No. 1 cause-- subconsciously mostly, but not only-- No. 1 cause of unhappiness.

这就是为什么，因为这是头号-,将自私等同于不道德是头号原因-,多数是在潜意识里-,导致不快乐的头号原因。

哈佛公开课 - 幸福课课程节选

Why? Because the labor is the unquestionable property of the laborer " and therefore, no one but the laborer can have a right to what is joined to or mixed with his labor.

为什么，因为劳动是劳动者无可争议的所有物,《政府论》第五章，“论财产“,因此除这名劳动者以外,对他施加或掺进劳动的所有物，别人没有所有权。

耶鲁公开课 - 公正课程节选