Wrinkles should merely indicate where smiles have been.

The study of psychology is not just about understanding others; it's also about understanding ourselves and how we interact with the world around us.

你以为早上醒来昨天就不算数了。但昨天才是真正算数的。

解释：君子不因为天色昏暗而毁弃自己的行为举止。

一本好书是通往另一个世界的门。