The beauty of mathematics lies in its ability to describe the universe in the most elegant way possible.

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

The truth is always revolutionary.

世界不是游乐场，而是思想和利益的战场。

正该来时，先生（老子）应时来到这世间；正该去时，先生顺时离开这世间。安于时势，顺应自然规律，哀乐就不能进入心中。