我认为最好的表演是本能的。它不是智力的，不是机械的，它是本能的。

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 balance of power is the only way to maintain peace in the international system.

我不害怕死亡，我害怕不去尝试。