Quantum cryptography doesn't rely on the difficulty of mathematical problems, but on the fundamental laws of physics.

死者并非无力。我说过，死了吗？没有死亡，只有世界的变化。

唱歌不是为了出名，而是因为热爱。

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

明白事理的人使自己适应世界；不明事理的人想使世界适应自己。所以，所有进步都要靠不明事理的人。

Great spirits have often encountered violent opposition from weaker minds.

Sustainability is not an option; it's a necessity for long-term success.