If the latter, if this hierarchy of intelligence or this hierarchy of the rational is the result of upbringing, ? then how can slavery be defended as natural?

若是后者，即智慧的阶级制度,或说理性的阶级制度,是教养的结果，那奴役如何能以自然演变加以辩护？

耶鲁公开课 - 政治哲学导论课程节选

It's dangerous to abruptly intervene in the evolution of human institutions.

在人文制度的演变中,突然的人为干预是很危险的

耶鲁公开课 - 美国内战与重建课程节选

The classical hoplite formation then was not the long lived military institution of scholarly tradition, but merely one phase in a history of almost four centuries of slow change towards ever denser and more cohesive heavy infantry formations."

这种方阵的形成,并不是经过长期传承的传统军事制度,只是步兵阵型演变的一个阶段,战阵逐渐向更加紧密坚固的步兵阵型转化,而这个变化持续了约有四个世纪"

耶鲁公开课 - 古希腊历史简介课程节选