释义：善于把握事物本质的人，不会违背金属和水的本性；善于制作器物的人，不会改变物体的形状和用途。

I keep challenging myself because I don't want to repeat.

You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it. Seek negative feedback, particularly from friends.

艺术规则并非武断；它们建立在理性和事物的本质之上。

调动洋人的敌对国家来攻打洋人，学习洋人先进的技术来制服洋人。