战略的本质是你必须对想要完成的事情设定限制。

最大的智慧是认识到自己的无知。

You are not only responsible for what you say, but also for what you do not say.

The teacher must believe in the potential of his students. He must see in each one of them a spark of the divine fire.

解释：大部分药材都以新鲜为好，但艾草却以陈年的为佳，体现了药材使用的特殊性。