The nature of drugs is hard and violent, just like that of imperial soldiers. Since soldiers are so savage and impetuous, how could anybody dare to deploy them recklessly? If they are deployed inappropriately, harm and destruction will result everywhere. Similarly, excessive damage is the consequence of drugs thrown at illnesses. A good doctor first makes a diagnosis, and having found out the cause of the disease, he tries to cure it first by food. When food fails, then he prescribes medicine.
