Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently.
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。
所有没有杀掉我的就只会令我更顽强！
Every time we look deeper into the fabric of reality, we find more questions than answers.
The power of causal reasoning is that it allows us to predict the effects of actions we have never taken.
I believe in the power of positive thinking.
数学的目标是理解我们观察到的现象背后的结构。