"In the midst of winter, I found there was, within me, an invincible summer."

Silence is the language of the oppressed.

Efficiency is doing things right; effectiveness is doing the right things.

勇气是所有美德中最重要的，因为没有勇气，你就无法始终如一地实践其他美德。

电子是最重要的化学实体。