人都知道说话可以显示自己的优点，但不知说话谨慎可以培养德性；人都知道饮食可以有益生命，却不知节制饮食可以养生。

"We are all the authors of our own lives, but we are also the characters in someone else's story."

Your smarts will come in handy because you will travel in a land of marvels. We humans -- plodding as we are -- will astonish ourselves. We'll invent ways to generate clean energy and a lot of it. Atom by atom， we'll assemble tiny machines that will enter cell walls and make repairs. This month comes the extraordinary but also inevitable news that we've synthesized life. In the coming years， we'll not only synthesize it， but we'll engineer it to specifications. I believe you'll even see us understand the human brain. Jules Verne， Mark Twain， Galileo， Newton -- all the curious from the ages would have wanted to be alive most of all right now. As a civilization， we will have so many gifts， just as you as individuals have so many individual gifts as you sit before me.

一本好书的衡量标准在于它是否能让你思考、感受并以不同的方式看待世界。