Perhaps Hippocrates' most striking direct contribution to psychotherapy is his aphorism with regard to pain. He said: "Of two pains occurring together in different parts of the body, the stronger weakens the other." When {11} the attention is distracted from pain, then it is lessened. Of two pains, then, only the one that attracts the most attention is much felt, and, if a slight pain is succeeded by a severe pain in another part of the body, the lesser pain will apparently become trivial, or, indeed, not be felt at all. In Plato we find the direct philosophic expression of the value of psychotherapy. There had been during the preceding century a great increase in information with regard to the facts of physical nature, and especially the sciences relating to the human body, and so men had come, as they are prone to at such eras--our own, for instance--to think too much of the body and too little of the mind that rules it. Accordingly, we have from Plato a deliberate, emphatic assertion of this great truth under circumstances which make us realize how keenly he appreciated its significance for the art of medicine and for humanity. Professor Osier, in his address, "Physic and Physicians as Depicted in Plato," [Footnote 1] tells a story which shows clearly how much the great Greek philosopher appreciated the place of psychotherapy. [Footnote 1: "AEquanimitas and Other Addresses."] Charmides had been complaining of a headache, and Critias had asked Socrates to make believe that he could cure him of it. Socrates said that he had a charm which he had learnt, when serving with the army, of one of the physicians of the Thracian king. Zamolxis. This physician had told Socrates that the cure of a part should not be attempted without treatment of the whole, and, also, that no attempt should be made to cure the body without the soul, "and, therefore, if the head and body are to be well, you must begin by curing the mind; that is the first thing. And he who taught me the cure and the charm added a special direction. 'Let no one,' he said, 'persuade you to cure the head until he has first given you his soul to be cured. _For this,'_ he said, _'is the great error of our day in the treatment of the human body, that physicians separate the soul from the body._'"