Intolerance of groups is often, strangely enough, exhibited more strongly against small differences than fundamental ones.
很奇怪地，群体之间更常发生的分歧是源于零星的琐事，而不是重要的大事。

——Sigmund Freud, Moses and Monotheism (1938)
——西格蒙德·弗洛伊德，《摩西与一神论》