Orthodox Christianity, in the words of the Fathers.

Current corpus

• Old Testament: 52 books (Septuagint, Updated Brenton English)
• New Testament: 27 books (World English Bible, Greek Majority Text)
• Apostolic Fathers: 15 works (Lightfoot, c. 95–175 AD)
• Early Apologists: Justin Martyr, Tatian, Athenagoras, Theophilus (ANF, c. 155–180 AD)
• Ante-Nicene Theologians: St Irenaeus of Lyons; Clement of Alexandria; Tertullian of Carthage (32 works); St Hippolytus of Rome; Origen of Alexandria (received critically per the 553 anathemas); St Cyprian of Carthage (83 epistles + treatises)
• Ecumenical Councils: All seven (Nicaea I, Constantinople I, Ephesus, Chalcedon, Constantinople II & III, Nicaea II) + the Quinisext (Trullo) Council + the locally accepted canons of Ancyra, Gangra, Sardica, Carthage et al. (NPNF II.14)
• Post-Nicene Greek Fathers: St Athanasius the Great (18 works); St Basil the Great (On the Holy Spirit, Hexaemeron, 356 Letters); St Gregory the Theologian (24 Orations, Letters); St Gregory of Nyssa (Dogmatic, Ascetic, Philosophical, the Great Catechism, …); St Cyril of Jerusalem (24 Catechetical Lectures); St John Chrysostom (22 works, On the Priesthood, the Statues, complete Homilies on Matthew, John, Acts, the Pauline epistles, Hebrews) (NPNF I.9–14); St Cyril of Alexandria: architect of Orthodox Christology, who led the Council of Ephesus (Commentary on John in 12 books, Five Tomes Against Nestorius, That Christ is One, Scholia on the Incarnation, Pusey LFC 1874–1885); St John of Damascus (Exposition of the Orthodox Faith, NPNF II.9; Three Treatises on the Divine Images; Three Homilies on the Dormition, Allies 1898)
• Corpus Areopagiticum: Pseudo-Dionysius the Areopagite (c. 500 AD) (received critically, pseudonymous, cited extensively by St Maximus, St John of Damascus, and the hesychast tradition): Divine Names, Mystical Theology, Celestial Hierarchy, Ecclesiastical Hierarchy, Letters (Parker 1897–1899)
• Early Church Historians & Latin Fathers (4th–5th c.): Eusebius of Caesarea (Church History, Life of Constantine), Socrates Scholasticus, Sozomen, Blessed Theodoret of Cyrus, St Hilary of Poitiers (De Trinitate, De Synodis, Psalm Homilies), St Jerome (Letters, Treatises, Lives of Illustrious Men), Rufinus of Aquileia (NPNF II.1–3, II.9)
• St Augustine of Hippo: Confessions, City of God, Tractates on John, Enarrationes on the Psalms, Sermon on the Mount, Harmony of the Gospels, Sermons on the NT, Letters, Doctrinal/Moral Treatises (including De Trinitate, Enchiridion, On Catechizing the Uninstructed), Anti-Manichaean, Anti-Donatist, Anti-Pelagian (NPNF I.1–8)
• Other Latin Fathers & Bridges: St Ambrose of Milan (Dogmatic Treatises & Letters); St John Cassian (Institutes, Conferences, On the Incarnation); St Vincent of Lérins (the Commonitorium); Sulpitius Severus (Life of St Martin); St Leo the Great (Tome, Letters & Sermons); St Gregory the Great the Dialogist (Pastoral Rule, Letters) (NPNF II.10–13)
• Syriac Fathers: St Ephraim the Syrian (Nisibene Hymns, Nativity and Epiphany Hymns, The Pearl, Homilies); Aphrahat the Persian Sage (Select Demonstrations) (NPNF II.13)
• Late ante-Nicene + early liturgical sources: St Methodius of Olympus (Symposium, On the Resurrection); St Dionysius the Great of Alexandria; St Peter of Alexandria; St Alexander of Alexandria (anti-Arian letters); Lactantius (Divine Institutes, On the Death of the Persecutors); the Apostolic Constitutions; the early Divine Liturgies of St James, St Mark, and the Clementine (ANF Vols 6–7)
• 2nd-c. Fragments: Papias of Hierapolis, Quadratus, Melito of Sardis, Hegesippus, Polycrates, Pantaenus(ANF Vols 1 & 8)

Total: over 110,000 paragraph-level passages across 280+ works by 78 authors, the patristic corpus through the 8th century in a single searchable, semantically embedded, work-filterable knowledge base. For the exact current counts and the full work index, browse the library.

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