The first fruits of the literary career of St Augustine, the great theologian and Christian philosopher par excellence, are the dialogues he wrote at Cassiciacum in Italy following his famous conversion in Milan in AD 386. These four little books, largely neglected by scholars, take up the ancient philosophical project of identifying the principles and practices that heal human desires in order to attain happiness, renewing this philosophical endeavour with insights from Christian theology. Augustine's later books, such as the Confessions, would continue this project of healing desire, as would the writings of others including Boethius, Anselm, and Aquinas. Mark J. Boone's The Conversion and Therapy of Desire investigates the roots of this project at Cassiciacum, where Augustine is developing a Christian theology of desire, informed by Neoplatonism but transformed by Christian teaching and practices.

Augustine identified reason and authority as complementary ways of learning the truth, and he employed both to explore such perennial questions as the rationality of faith, the nature of the good life, the problem of evil, and the relation of God and the soul. Eight writings of Augustine represent his application of these two methods to these four topics: On the True Religion, On the Nature of Good, On Free Choice of the Will, On the Teacher, On the Usefulness of Believing, On the Good of Marriage, Enchiridion, and Confessions. In Reason, Authority, and the Healing of Desire in the Writings of Augustine, Mark Boone explains Augustine's theology of desire in this cross-section of his works. Throughout his writings and in many ways, Augustine develops a Platonically informed, yet distinctively Christian account of desire. Human desire should respond to the goodness inherent in things, loving the greatest good above all and great goods more than lesser goods. Above all, we should love God and souls. Sin, an inappropriate desire for lesser goods, is healed by the redemption of Christ.

The Enarrationes in Psalmos is the collection of Augustine's commentaries and sermons on the Psalms. Although Augustine is often at his philosophical best here, bearing various resemblances to the Platonists and other philosophers, he also articulates a distinctively Christian view on what we should desire, on how desire has gone wrong, and on how it is healed. The renewal of desire takes place as a result of and through the unity of Christ and the church, which is the guiding theme of the Enarrationes. Augustine's Preaching and the Healing of Desire in the Enarrationes in Psalmos traces this theology of desire as it connects to Augustine's Christology, his ecclesiology, his account of happiness and well-being, and his eschatology. The book closes with some suggestions on what the church can learn today from the Enarrationes in the areas of psychology and wellbeing, biblical exegesis, and homiletics.