In Christian Latinity, the tractate is a specific type of sermon, delivered as part of a liturgy, which combines scriptural exegesis, preaching, spiritual commentary, and theological reflection. This volume contains the first ten of the 124 tractates on the Gospel of John delivered by St. Augustine, the world-renowned fourth-century bishop of Hippo Regius in North Africa. As sermons they exemplify the theory of preaching he outlined in his De doctrina Christiana (On Christian Instruction) —to preach in a simple and direct style accessible to all without compromising the theological knowledge and spiritual experience of the message. Because John's Gospel particularly emphasized the divinity of Jesus, the identity of the historical Jesus with the Messianic Christ, the Trinitarian Word, these sermons necessarily involve much Trinitarian and Christological theology. They explain and defend the orthodox position established at the councils of Nicea (A.D. 325) and Constantinople (A.D. 381). Their major theme is that Jesus Christ is the center of the Christian life, the Son of God and the Son of Man. Beyond contemplation of John's Gospel, the Tractates reveal much about the heresies to which Augustine's congregation was exposed: Manichaeism, with its dualistic logic; Donatism, a schismatic, puritanical, and sacramental movement which involved the intervention of the state in the affairs of the Church; and Pelagianism, with its doctrines of original sin, grace, free will, and predestination. Augustine delivered these sermons in Ciceronian oratorical style, having as his purpose to teach, to please, and to persuade. Through his allegorical exegesis, his audience was led to an understanding of the meaning of Scripture that would so affect their souls as to help them grow spiritually and bring them to eternal salvation.
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Aurelius Augustinus Hipponensis, in English Augustine of Hippo, also known as St. Augustine, St. Austin, was bishop of Hippo Regius (present-day Annaba, Algeria). He was a Latin philosopher and theologian from the Africa Province of the Roman Empire and is generally considered as one of the greatest Christian thinkers of all times. His writings were very influential in the development of Western Christianity. According to his contemporary Jerome, Augustine "established anew the ancient Faith." In his early years he was heavily influenced by Manichaeism and afterward by the Neo-Platonism of Plotinus. After his conversion to Christianity and his baptism in 387, Augustine developed his own approach to philosophy and theology, accommodating a variety of methods and different perspectives. He believed that the grace of Christ was indispensable to human freedom, and he framed the concepts of original sin and just war. When the Western Roman Empire was starting to disintegrate, Augustine developed the concept of the Catholic Church as a spiritual City of God (in a book of the same name), distinct from the material Earthly City. His thoughts profoundly influenced the medieval worldview. Augustine's City of God was closely identified with the Church, the community that worshiped the Trinity. In the Catholic Church and the Anglican Communion, he is a saint and pre-eminent Doctor of the Church. Many Protestants, especially Calvinists, consider him to be one of the theological fathers of the Protestant Reformation due to his teaching on salvation and divine grace. In the Eastern Orthodox Church he is also considered a saint. He carries the additional title of Blessed. Among the Orthodox, he is called "Blessed Augustine" or "St. Augustine the Blessed". Santo Agostinho
