The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.

语言是作家最强大的武器，用它作家可以改变世界。

学习数学的最好方法就是去做数学。