"A nation that destroys its soils destroys itself. Forests are the lungs of our land, purifying the air and giving fresh strength to our people."

"The colony is the place where the project of a new humanity is to be tested, where the dream of a world without borders is to be realized, where the dream of a world without races is to be realized, where the dream of a world without nations is to be realized."

这句话其实是莎士比亚借哈姆雷特之口说的，但是霍金非常喜欢，曾在自己著作中多次引用，所以很多人误以为本句话是霍金说的。

你必须无畏地追求让你灵魂燃烧的东西。

Technology should serve human nature, not change it.