《淮南子·说林训》
善于用人者，就像盚虫之百脚，多而不会互相伤害；又好像嘴唇和牙齿，尽管柔软和坚硬经常摩擦，但并不互相伤害。
善用人者，若蚈之足，众而不相害；若唇之与齿，坚柔相摩而不相败。
Those who are good at using people are like the centipede's hundred feet, which are numerous and will not harm each other; they are also like lips and teeth, which are soft and hard and often rub against each other, but do not harm each other.