Mental illnesses are subtler than physical illnesses, though up to now mental illnesses have not been thoroughly explored, but when this has been done we shall find that all physical illnesses have some connection with them. The mind and the body stand face to face. The body reflects its order and disorder upon the mind, the mind reflecting at the same time its harmony and disharmony on the body; and it is for this reason you will find that many who are ill outwardly also have some illness of the mind, and very seldom will one find a case where a person is mentally ill and physically perfectly well.