We must accept finite disappointment， but never lose infinite hope.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
The spread of liberal democracy has been accompanied by the spread of a global culture that is increasingly homogeneous.
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.
The beauty of mathematics only shows itself to more patient followers.
The patient must always be at the center of everything we do.