Happiness is not just the absence of sadness; it's the presence of meaning.

The beauty of mathematics lies in its ability to reveal hidden symmetries and truths.

【讲解】：不怕东西少而怕分配不均匀，不怕贫困而怕不安定。

There will be obstacles. There will be doubters. There will be mistakes. But with hard work, there are no limits.

A word after a word after a word is power.

解析：强调人心就是天理，无需外求。