The right of a nation to kill a tyrant in case of necessity can never be doubted until the right of a tyrant to kill a nation has been proved.

宁可放过十个有罪之人，也不冤枉一个无辜者。

The dead have left us clues in their DNA.

数学家最好的作品是艺术，一种高度完美的艺术，像想象的最秘密的梦想一样大胆，清晰而透明。