最好的数学不仅仅是逻辑的；它是直观和创造性的，将严谨与想象力结合在一起。
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.
Business opportunities are like buses, there's always another one coming.
