关键不是消除恐惧，而是控制它。

真正的喜悦精神、崇高感、超越人类的感觉，这是最高卓越的试金石，在数学中肯定能找到，就像在诗歌中一样。

I'm just like anyone. I cut and I bleed. And I embarrass easily.

选自汉·桓宽《盐铁论·申韩》。曲木，弯曲的木头。恶，厌恶、怕。绳，木匠用以裁曲取直的墨绳。奸邪，奸邪之人。正法，公正无私的法律。这句话以曲木畏直绳作类比，说明公正无私之法对奸邪之人的威慑作用。

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 key to good design is to make things simple, but not simpler.

我们生产的每一桶石油都必须是尽可能负责任地生产出来的。