The footsteps of Nature are to be traced, not only in her ordinary course, but when she deviates from it in her most extravagant excursions.

Science is the knowledge of consequences, and dependence of one fact upon another.

才华比食盐还廉价。才华横溢者与成功者的区别在于大量的努力。

我只知道我什么都不知道。