发愤忘食，乐以忘忧，不知老之将至云尔。
发愤研究学问，常常忘记吃饭，一旦有所收获便又高兴地忘记了忧愁，连自己的渐趋衰老也没有感觉到。
The light of truth will eventually pierce the darkness.
The best time to plant a tree was 25 years ago. The second best time is today.
这就好像自己赤裸着身体却指责别人掀起衣服不礼貌一样。
The world is what it is; men who are nothing, who allow themselves to become nothing, have no place in it.