悲伤是我们为爱付出的代价。
Grief is the price we pay for love.
你越深入数学，就越意识到还有多少未知。
The text is a tissue of quotations drawn from the innumerable centers of culture.
可持续性不是成本，而是对我们未来的投资。
我不是说唱歌手，我是一个诺贝尔奖得主。
When you have to kill a man it costs nothing to be polite.
Don't be afraid to make mistakes. If you're not making mistakes, you're not trying hard enough.