The most dangerous strategy is to jump a chasm in two leaps.

When I got tired, I slept. When I got hungry, I ate. When I had to go, you know, I went.

人不是环境的产物；相反，环境允许或刺激他的发展。

The press is the best instrument for enlightening the mind of man, and improving him as a rational, moral and social being.

Be slow to fall into friendship，but when you are in，continue firm and constant.

化学的艺术在于分离、识别和量化不同物质的能力。