Ecclesiastes: On the Art of Preaching (Latin: Ecclesiastes: sive de ratione concionandi) was a 1535 book by Desiderius Erasmus. One of the last major works he produced, Ecclesiastes focuses on the subject of effective preaching. Previously, Erasmus had written treatises on the Christian layperson, Christian prince, and Christian educator. Friends and admirers, including Bishop John Fisher suggested that Erasmus write on the office of the Christian priesthood. He began writing the text in 1523, finally completing and printing Ecclesiastes in 1535.