The ancients said that you owe the doctor money and the doctor owes you life, which means to remind people not to just see that they owe others a favor and ignore others' help and contribution to themselves. The ancients said that you owe the doctor money and the doctor owes you life. When you owe the doctor money, you will think that you owe the doctor a favor, but in fact, the doctor also owes you a life. This is because, when treating diseases, doctors may have to bear the risk of mistakes in surgery or drug treatment, and these risks may lead to the life-threatening of patients. Therefore, although the patient owes the doctor money, the doctor also owes the patient his life. The original intention of this sentence is to remind people not to just see that they owe others a favor and ignore others' help and contribution to themselves.