别让他人看到你流血。

The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.

最有趣的艺术是提出问题的艺术。

【释义】：圣人处世的道理是灵活多变的，能根据时机和环境变化而采取合宜的行动，不拘泥于固定的方式。