《礼记·坊记》
父母健在之时，作儿子的就不敢认为身体是自己的，也不敢置备私产，这是教育人们要知道上下尊卑。
父母在，不敢有其身，不敢私其财，示民有上下也。
When the parents are alive, the son does not dare to think that the body is his own, and he does not dare to acquire private property. This is to teach people to know the superiority and inferiority of superiors and inferiors.