See U 1202

“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.” ----John Fitzgerald Kennedy
“我们选择在这十年里登月去做其他的事情，不是因为它们很容易，而是因为它们很难，因为这个目标将有助于组织和衡量我们最好的精力和技能，因为这个挑战是我们愿意接受的，是我们不愿意推迟的，是我们打算赢得的，其他的也一样。”----约翰·费茨杰拉德·肯尼迪