学习数学的唯一方法就是做数学。

Do every duty, and expect no reward for it.

Will you be clever at the expense of others， or will you be kind？

Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be. Many things prevent knowledge including the obscurity of the subject and the brevity of human life.

最有效的领导者是那些能够授权他人去领导的人。

总有一天 深藏的奸诈会渐渐显出它的原形。