To understand the universe, you must understand the language in which it is written, and that language is mathematics.
The most important thing is to have a vision of what you want to do and then to have the persistence to carry it out.
如果你能坦然面对胜利和灾难，对这两个骗子一视同仁……
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.