言语是唯一能永恒的东西。

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。

I'm not perfect, but I'm always me.

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.