当我看着这个世界时，我是悲观的，但当我看着人们时，我是乐观的。
When I look at the world I'm pessimistic, but when I look at people I am optimistic.
But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.
出自《魏源集·都中吟十三首》。洋人的情况、技术和版图，我都了解得像万里大的手掌中玩米和沙子一样。知己知彼是兵家的策略，一定要知道谁主掌着典属国的职位。