要这样行动，使得你意志的准则任何时候都能同时被看作一个普遍立法的原则。

The only way to learn mathematics is to do mathematics.

A man of genius makes no mistakes. His errors are volitional and are the portals of discovery.

The death of a beautiful woman is, unquestionably, the most poetical topic in the world.

一个运营良好的采石场是物流、效率和团队合作的交响乐。