The only paradise is paradise lost.
量子通信的安全性来自物理定律，而不是计算复杂性。
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night, so don't give up today.
写作是一种勇气，面对自己的恶魔。
他在主张杠杆原理时所说。
The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
释义：在富贵时，朋友无数；一旦遭遇困难，却无人帮助。