During its first four centuries, Christianity produced some of the world’s most profound historical, theological, and philosophical literature. This collection comprises an enormous selection of their work, including heart-wrenching martyrdom narratives, intimate letters, remarkable biblical commentaries, and profound philosophical and theological treatises. Contributors include some of the most influential thinkers in world history—such as Justin Martyr, Athanasius, Augustine, and Jerome—as well as lesser-known and controversial figures such as Origen, Maximus the Confessor, and Cyprian of Carthage.

Our largest package, the 2025 Ultimate Library, provides an incredible library for biblical research and theological reflection. Whether focused on Church history or biblical exegesis, the vast collection of resources and titles at your fingertips cover the gamut—from most devotionals to practical discussions of pastoral ministry to the most rigorous scholarly and academic research. This package has everything you need to engage in the serious study of Scripture and its world, with respected resources like the Library of Hebrew Bible/Old Testament Studies | LHBOTS (382 vols.) and top-tier exegetical commentaries like the New International Commentary on the Old and New Testament | NIC (51 vols.).

The cessation of persecution with the conversion of Constantine allowed Christian writers to begin exploring theology and expounding Scripture more comprehensively. The many works in this collection demonstrate these new horizons of Christian thought in the post-Nicene era through innovative biblical commentary, poems, letters, theological treatises, and spiritual biographies.

Engage with the Fathers of the Church with our most complete patristics collection. The Master Patristics Collection contains readable and accurate translations of the Fathers from the first seven centuries of the Church. This collection comprises an enormous selection of their work, including Biblical commentaries, homilies, treatises, and letters.

Isidore of Seville is one of the dominant contributors to the development of medieval Catholic theology. Sententiae, his major theological work, is arranged in three divisions or books. The first is a dogmatic part, presenting the doctrinal assertions of the Catholic faith. This is followed by two additional books, developing the moral principles and correct behavior necessary to attain eternal union with God, the highest good―summum bonum―who is the subject of the first assertion of faith in Book 1. The work presents a marvelously holistic view of faith and action, developing the relationship between the intellectual and moral, the individual and social life of the Christian believer, all in the context of eternal life.