仅仅防范各级官府的暴政是不够的，还需防范优势意见和大众情感的暴政，防范社会即便不用民事惩罚，也能有法将自己的观念和做法作为行为准则强加于异见者的趋势，防范社会束缚与自己不相一致的个性的发展，甚至有可能遏止其形成，从而使所有人都必须按照社会自身的模式来塑造自己的那种倾向。集体意见对于个人独立的合法干涉是有一个限度的。发现这一限度并维护其不受侵蚀，对于使人类事务进至良善之境来说，正像防范政治上的专制一样，是不可或缺的。
Protection, therefore, against the tyranny of the magistrate is not enough; there needs protection also against the tyranny of the prevailing opinion and feeling; against the tendency of society to impose, by other means than civil penalties, its own ideas and practices as rules of conduct on those who dissent from them; to fetter the development, and, if possible, prevent the formation, of any individuality not in harmony with its ways, and compel all characters to fashion themselves upon the model of its own. There is a limit to the legitimate interference of collective opinion with individual independence; and to find that limit, and maintain it against encroachment, is as indispensable to a good condition of human affairs, as protection against political despotism.引自 第一章：引论
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