不只是国家有染的问题,对士而言也有受到熏染的问题。 
一个人最危险的敌人是他自己的口舌。
大丈夫应当早晨还在碧海,傍晚就到达苍梧山(形容志向远大,行动迅速)
The beauty of mathematics is that it allows us to abstract away from the physical world and focus on the underlying principles.