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.
历史的任务不是评判，而是理解。
向一个人展示他在错误中是一回事，让他掌握真理是另一回事。
The language of mathematics is universal, transcending cultural and linguistic barriers.