“What, then? Is not correction sometimes necessary?” Of course it is; but with discretion, not with anger; for it does not injure, but heals under the guise of injury. We char crooked spearshafts to straighten them, and force them by driving in wedges, not in order to break them, but to take the bends out of them; and, in like manner, by applying pain to the body or mind we correct dispositions which have been rendered crooked by vice. So the physician at first, when dealing with slight disorders, tries not to make much change in his patient’s daily habits, to regulate his food, drink, and exercise, and to improve his health merely by altering the order in which he takes them. The next step is to see whether an alteration in their amount will be of service. If neither alteration of the order or of the amount is of use, he cuts off some and reduces others. If even this does not answer, he forbids food, and disburdens the body by fasting. If milder remedies have proved useless he opens a vein; if the extremities are injuring the body and infecting it with disease he lays his hands upon the limbs; yet none of his treatment is considered harsh if its result is to give health.