Before you heal someone, ask him if he's willing to give up the things that make him sick. - Hippocrates

Natural forces within us are the true healers of disease.

[O]f articles of food, those which are unsuitable and hurtful to man when administered, every one is either bitter... or saltish or acid, or something else intense and strong, and therefore we are disordered by them... But all those things of which a man eats and drinks are devoid of any such intense and well-marked quality... which man is accustomed to use for food, with the exception of condiments and confectionaries, which are made to gratify the palate and for luxury. And from those things, when received into the body abundantly, there is no disorder nor dissolution of the powers belonging to the body; but strength, growth, and nourishment... for no other reason than because they are well mixed, have no thing in them of an immoderate character, nor anything strong, but the whole forms... [of] simple and not strong substance.

The soul is the same in all living creatures, although the body of each is different.