We must not overlook the role that extremists play. They are the gadflies that keep society from being too complacent.
我们不能忽视那些钻牛角尖的人们的重要性。他们像牛牤一样，让这个社会不至于太过自满。

——Abraham Flexner, Universities
——亚伯拉罕·弗莱克斯纳