事情过后议论别人，身在局外议论局内人，是做学问的人最容易犯的毛病。在事后议论别人，往往将聪明人说得极其愚笨；身在局外议论局内的人，往往将困难的事情说得极其容易，这两种毛病都是由待人不忠诚、不宽容而引起的。

The best traders are those who can think independently.

Desperately awaiting the release of his new book. Clean your room to set your house in order but don't be afraid to break the rules either. Greetings from a JP fan from Nepal.

我越是思考语言，就越惊讶于人们竟然能够相互理解。

数学是一门活生生的学科，随着新的思想和发现不断演变。