It is not shame for a man to learn that which he knows not，whatever his age.

I think it's important to keep challenging yourself, to keep growing.

I'm not a prophet, I'm not a saint, I'm just a voice.

代数簇的算术证明了抽象思维的力量。

Of the people, by the people, for the people.

停在港口的船是安全的，但那不是造船的目的。

The ordinary is always political.

法律是蜘蛛网，大苍蝇可以穿过去，小苍蝇却被困住。