我们对过去了解得越多，就越能理解现在。

To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

Innovation in animal husbandry is not just about technology; it's about understanding the needs of both animals and farmers.

The habits of life form the soul, and the soul forms the countenance.

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。