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.

You don't have to be perfect to be loved.

解释：要量力而行，实力达得到就进攻，达不到就撤退。

历史学家的任务是理解过去，而小说家的任务是让它活过来。

职位越高，错误的代价越大。