The best time to buy stocks is when they are out of favor.

I don't make music for the radio; I make it for the soul.

小说的艺术在于创造一个比现实本身更真实的世界。

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。

The essence of mathematics is not to make simple things complicated, but to make complicated things simple.