The greatest happiness is to despise what deserves to be despised.

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

The language of mathematics is the language of the universe, and by learning it, we can understand the cosmos.

对于忠告，你所能做的，就是把它奉送给别人，忠告从来就不是给自己准备的。

"世界上充满了面带友好的怪物。"