This is an important book, and it is an excellent one: closely argued, meticulously documented, and very well written. It not only brings al-Tawhīdī more sharply into focus by clearing away the many misconceptions that have obscured his reputation. It also brings his thought alive. It shows how intricately interwoven his ethical propositions were with those of his contemporaries, notwithstanding their frequent, and substantial, differences. - Review by Eric Ormsby, Freie Universitat Berlin; Philosophy East & West Volume 67, Number 2 April 2017 602–605