A good mathematician is someone who can see analogies between theorems. A great mathematician is someone who can see analogies between analogies.

在冬天的深处，我发现我内心有一个不可战胜的夏天。

一个人若不能治理自己，便不能治理家庭；若不能治理家庭，便不能治理城市；若不能治理城市，便不能治理国家。

宇宙充满了神奇的事物，耐心地等待着我们的智慧变得更加敏锐。