It's because man alone has the faculty of speech and the ability to distinguish good from bad,and right from wrong.

这是因为人类有演讲的才能,也有能力,明辨是非,分辨正误

耶鲁公开课 - 古希腊历史简介课程节选

What must this experiment have the potential to do, to be a valid scientific experiment?

实验必须有做什么的能力,才能被称为一个有效的科学实验呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

What turns out to be the practical fact is that he who has the power and the will to do what he wants will be able to do so, and he who has not will be forced to suffer whatever the powerful impose on him.

事实上只有有能力及意愿,去做某事的人,才能最终做成某事,而没有能力或意愿的人则会因之,而遭受不幸

耶鲁公开课 - 古希腊历史简介课程节选