自由并非存在于对自然法则的梦幻般的独立之中，而是存在于对这些法则的认知中，以及由此产生的有系统地使它们朝着明确目标发展的可能性中。
Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.
世界是一个谜题；碎片散落一地，没有人有盒子上的图片。
你能给自己最好的礼物就是自爱。
The world is a book, and those who do not travel read only one page.
The highest goal of education is not knowledge, but action.
伟大的领导者不创造追随者；他们创造更多的领导者。