To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.  

人对他自己建筑起堤防来。

我认为不断学习和成长很重要。

质量不是理论；它是一种实践。

Happiness and unhappiness depend upon the opinion we have of things.

适应是心智最伟大的成就。