要理解现在，必须先理解过去。
To understand the present, you must first understand the past.
The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
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.
思想和背景的多样性是推动任何组织创造力和创新的动力。