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.

Philosophy is the art of asking the right questions and seeking wisdom in the unknown.

语言是唇上的美酒。

We feel free when we escape ,even if it be but from the frying pan to the fire.

Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.