The heart is the most important organ of the body, if it is correct the body will be correct and if it is diseased the whole body will suffer. The prophet (saw) said, “There is an organ in the body, if it is correct the whole body will be correct but if it is corrupted, the whole body will be corrupted. Verily it is the heart.”. Diseases of the heart are not only physical in nature but could be diseases of the mind such as envy, grudges, despair, depression and fear. Healing these diseases are not as easy as taking a pill but requires changes in character and attitudes. The Qur’an and Sunnah offers the answers to these sicknesses of the heart as detailed in this Islamic book by Dr. Muhammad Az-Zahrani.