The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。
地图不是领土。
心理学必须是纯粹实验性和分析性的。
实现明天的唯一限制是我们今天的疑虑。
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.