"The credibility of your results depends on the plausibility of your identifying assumptions."

改变生活的方法：立即开始。充满激情地去做。没有例外。

The true test of civilization is not the census, nor the size of cities, nor the crops, but the kind of man that the country turns out.

Silence is the virtue of fools.

能杀死我的那颗子弹至今尚未铸造出来。