Dr. Kiva Shtull, M.D., has studied prayers across many cultures, and has compiled this work from over 40,000 quotes, over the course of 15 years. He served as a congregational Rabbi for 12 years, and continues to practice medicine. He has also created Wisdom I and Wisdom II, a collection of 3,600 of the best quotes of all time, arranged in 360 chapters, each of which contains 10 topics.