最强大的人永远不足以始终成为主宰，除非他将力量变为权力，服从变为义务。

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.

In the world of computation, complexity is not an enemy, but a challenge to be understood and mastered.