Orthodox Theological Library

• St. Vincent of Lerins:Commonitory
• St. Basil the Great:Hexaemeron
• St. Ignatius of Antioch:Epistle to St. Polycarp|Epistle to the Ephesians
• Tertullian:The Prescription Against Heretics
• St. Irenaeus:The Proof of the Apostolic Preaching
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus
• Photius:Bibliotheca

The Holy Trinity and Filioque

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Gregory of Nyssa:Against Eunomius|On the Making of Man|On the Soul and the Resurrection
• St. Gregory of Nazianzus:Theological Orations
• St. Basil the Great:Hexaemeron
• St. Gregory Palamas:The One Hundred and Fifty Chapters
• St. Mark of Ephesus:Encyclical Letter
• St. Athanasius:Four Discourses Against the Arians
• Pseudo-Dionysius the Areopagite:The Divine Names|The Mystical Theology|The Ecclesiastical Hierarchy
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus

Creation, the Fall, and Evil

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Gregory of Nyssa:On the Making of Man|On the Soul and the Resurrection
• St. Basil the Great:Hexaemeron
• St. Irenaeus:The Proof of the Apostolic Preaching
• St. Augustine:On the Predestination of the Saints
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow

The Incarnation and Christology

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Gregory of Nazianzus:Theological Orations
• St. Cyril of Alexandria:Commentary on John|Five Tomes Against Nestorius|That Christ is One
• St. Athanasius:Four Discourses Against the Arians
• St. Gregory Palamas:The One Hundred and Fifty Chapters
• Confession of Dositheus

Salvation Exclusively in Christ

• St. Justin Martyr:First Apology|Dialogue with Trypho
• St. Cyril of Alexandria:That Christ is One
• St. Irenaeus:The Proof of the Apostolic Preaching
• St. Ignatius of Antioch:Epistle to St. Polycarp|Epistle to the Ephesians
• Confession of Dositheus

Baptism and Chrismation

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. John Chrysostom:Instructions to Catechumens
• St. Cyril of Alexandria:Commentary on John
• St. Ignatius of Antioch:Epistle to the Ephesians
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus

The Holy Eucharist

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Cyril of Alexandria:Commentary on John
• St. John Chrysostom:On the Priesthood
• St. Ignatius of Antioch:Epistle to the Ephesians
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus

Hope, Prayer, and Synergy

• St. John Chrysostom:Instructions to Catechumens
• St. Gregory of Nyssa:On the Soul and the Resurrection
• The Longer Catechism by St. Philaret of Moscow
• St. Augustine:On the Predestination of the Saints

Charity and the Commandments

• St. John Chrysostom:Against the Jews (Homilies 1–8)
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus
• Tertullian:The Prescription Against Heretics

Veneration of Saints and Icons

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)|Apologia Against Those who Decry Holy Images
• Pseudo-Dionysius the Areopagite:The Ecclesiastical Hierarchy
• St. Gregory of Nazianzus:Theological Orations
• The Orthodox Confession of St. Peter Mogila
• The Longer Catechism by St. Philaret of Moscow

Angels and Demons

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• Pseudo-Dionysius the Areopagite:The Divine Names|The Mystical Theology|The Ecclesiastical Hierarchy
• St. Irenaeus:The Proof of the Apostolic Preaching
• The Longer Catechism by St. Philaret of Moscow

The Toll-Houses and Particular Judgment

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Gregory of Nyssa:On the Soul and the Resurrection
• The Orthodox Confession of St. Peter Mogila

The Intermediate State

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Gregory of Nyssa:On the Soul and the Resurrection
• The Orthodox Confession of St. Peter Mogila
• Confession of Dositheus

The Last Judgment

• St. John of Damascus:Exposition of the Orthodox Faith (Books I–IV)
• St. Jerome:Commentary on Daniel
• St. Gregory of Nyssa:On the Soul and the Resurrection
• St. Justin Martyr:First Apology
• St. Athanasius:Four Discourses Against the Arians
• The Longer Catechism by St. Philaret of Moscow
• Confession of Dositheus