I love you not because of who you are， but because of who I am when I am with you。

数学不仅仅是人类的发明；它具有一种独立于我们而存在的深刻现实。

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 only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next.

Poverty is not a character flaw—it’s a systemic trap.