To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

勇气不是没有恐惧，而是继续前进的意志。

幸福不是现成的东西。它来自你自己的行动。

真理不会在愤怒中被说出。如果有朝一日真理被说出，那一定是在爱中。

Curiosity and persistence are the driving forces behind scientific breakthroughs.