The highest knowledge is the knowledge of the self.

如果你确信自己走在正确的道路上，并且内心深知这一点，那么无论别人说什么，都无法让你动摇。

The despotism of custom is everywhere the standing hindrance to human advancement.

能量守恒定律不仅是一条经验法则，更是思维的必然要求。