Disciplining the SoulSpiritual Guidance by Ibn al Jawzi Curing the Diseases of the Heart This essential Islamic book by Ibn al Jawzi explores the facets of human nature and how they are meant for mankinds benefit. Desires such as hunger can nourish the body, while anger can protect from harm. However, when these natural impulses are not controlled, they can lead to spiritual harm and sin. For example, excessive desire for food results in gluttony, while uncontrolled anger