"This excellent book is at once a study of a specific aspect of medieval Islamic piety and a formidable commentary on the way intellectual, literary, and religious history should be studied. […] Ragab presents us with a richly textured and deeply satisfying account of how illness, medicine, and piety were intertwined in the Islamic Middle Ages. […] It is a work that will be essential and educational reading for scholars of many fields—including but not limited to religion, the history of medicine, hadith studies, and literary studies. […] I found it to be an outstanding contribution and see it as a model of interdisciplinary and cutting-edge scholarship." – Nancy Khalek in Isis: A Journal of the History of Science Society