数学中最重要的是理解概念，而不仅仅是记忆公式。

I am more interested in what can be done with the knowledge than in the knowledge itself.

The past is always present in the work I do.

人一定要懂得“礼”之后才能产生恭敬之心，产生恭敬之心以后才能有所尊敬，有所礼让。