The books that the world calls immoral are books that show the world its own shame.
【讲解】:古代读书人学习的目的,在于修养自己的学问道德(然后去为国家、人民服务),现在读书人学习的目的,在于给别人看(希望得到别人的赞美和任用)。
The best mathematics is that which you do not understand at first glance.