Emperor Taizong of the Tang Dynasty said: "The appointment of a famous master is like a skilled craftsman making wood. The straight ones are regarded as shafts, the crooked ones are regarded as wheels, the elders are regarded as pillars, and the short ones are regarded as arch angles. There is no straight or short length. , all kinds of things are done, and the wise man uses his strategy, the fool uses his strength, the brave uses his power, the prudent uses his prudence, and the unwise, foolish, courageous and prudent use them both, so a good general will never abandon his talent. "The master never abandons his people." Therefore, a wise leader always follows the principle of "the wise at the top, the capable at the middle, the mediocre at the bottom, and the wise at the side", so that all kinds of people can complement each other and win. .