I don't think that you have any insight whatsoever into your capacity for good until you have some well-developed insight into your capacity for evil.

建筑师必须是一位老师。

The best way to learn mathematics is to do mathematics.

Challenges are opportunities in disguise—if you're willing to look closely.

In the realm of quantum mechanics, the observer becomes a part of the experiment, altering the outcome by the mere act of observation.