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。
No one's actions can be completely understood unless they are seen in the context of that person's life as a whole.
We think not in isolated ideas, but in continuous streams of purpose-directed activity.