勇气并不在于无所畏惧地冒险，而在于坚决为正义事业而决心前行。

At the close of our studies， we knew all the past of physics， but nothing of the present and the future.

I have great faith in fools； self-confidence， my friends call it.

爱是一种行动，而不仅仅是一种感觉。

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.

A nation's strength grows from the fertility of its fields and the wisdom of its farmers.