痛苦的源头是无知。
The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.
历史在我们讲述的故事中鲜活存在。
孩子有超强的记忆力，当孩子可以动手操作而仅用眼看时，会记得更好。