勇气不是没有恐惧，而是战胜恐惧。
Courage is not the absence of fear, but the triumph over it.
The best way to predict the future is to invent it.
逻辑学研究不仅仅是关于推理规则，而是关于推理本身的本质。
相信有时是痛苦的。但如果停止相信，什么都不会开始。
The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.
如果你可以不去寻找别人的认同，那么你的力量就是无穷的。