In Wesley's time the causes of disease had been imperfectly understood, but there had been a strong belief in empiric "certain cures" and "tried remedies". Wesley had developed a reasoned view of which remedies were harmful, and was a thoughtful prescriber, feeling the need for treatment of the whole person. Wesley himself had claimed that men of learning had begun to set aside experience, to build on hypothesis, to form theories of diseases and their cure, and to submit these in the place of practical physics. As a firm believer in empiricism, Wesley had claimed that there was no more need for mystery in medicine than to appreciate the simple fact that "such a medicine removes such a pain" and should be used. The best physician, in Wesley's view, was not the one who talked best or who wrote best, but the one who performed the most cures, the one who walked the talk.
Clerical Medicine became the basis of natural medicine practice to which we owe Wesley a large and significant contribution. It could be claimed that he was one of our Fathers of Naturopathy. It can be thus be defined as: charitable medical services (Imitatio Christi) rendered to the poor using natural agents such as food, herbs, electricity, physic, water; "certain cures" and "tried remedies"; and supernatural agents including spiritual counseling, prayer, divination, and worship.
Excerpt from the Book: Modern Monastic, Clerical & Pastoral Medicine