Then God created the animal body from four natures, namely bile, blood, and phlegm, and He, Glory be to Him, placed in these humors spiritual forces whose effects appear in the body composed of them. If these humors in the body that appear from them are in moderation or close to moderation, they will give what moderation gives of the good and praiseworthy things. Economic movements in matters, even if they are not in moderation, give in accordance with what they deviate to, and the authority of the strongest and most of these humours appears in the body, and illnesses arise in the body from that, and morals arise in the soul from that .