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Primary texts

The Fathers, in longer form.

The works behind the catechesis — for the slower read.

Augustine, Athanasius, the Cappadocians, Symeon the New Theologian, Maximus the Confessor — the foundational voices of the Orthodox theological tradition.

81 works
St. Gregory of Nyssa

Against Eunomius — St. Gregory of Nyssa

4th century
St. Irenaeus of Lyon

Against Heresies — St. Irenaeus of Lyons

2nd century
St. Jerome

Against Jovinianus — St. Jerome

4th-5th century
St. John of Damascus

Against Those Who Oppose Holy Icons

8th century
St. Jerome

Against Vigilantius and Against John — St. Jerome

4th-5th century
St. Mark of Ephesus

Against the Errors of the Latins

15th century
St. Gregory of Nyssa

Answer to Eunomius

4th century
Various (Conciliar)

Canons of the Seven Ecumenical Councils

4th-9th century
St. Cyril of Jerusalem

Catechetical Lectures — St. Cyril of Jerusalem

4th century
St. Athanasius of Alexandria

Contra Gentes — St. Athanasius of Alexandria

4th century
St. Hilary of Poitiers

De Synodis — St. Hilary of Poitiers

4th century
St. Jerome

Dialogue Against the Pelagians — St. Jerome

4th-5th century
St. Justin Martyr

Dialogue with Trypho — St. Justin Martyr

2nd century
St. Athanasius of Alexandria

Discourses Against the Arians — St. Athanasius of Alexandria

4th century
Eusebius of Caesarea

Ecclesiastical History — Eusebius of Caesarea

4th century
St. Photius the Great

Encyclical to the Eastern Patriarchs

9th century
Anonymous (Apostolic)

Epistle of Barnabas — Unknown

2nd century
Anonymous

Epistle to Diognetus — Unknown

2nd century
St. Ignatius of Antioch

Epistles of Ignatius — St. Ignatius of Antioch

2nd century
St. John of Damascus

Exact Exposition of the Orthodox Faith — St. John of Damascus

8th century
St. Ambrose of Milan

Exposition of the Christian Faith — St. Ambrose of Milan

4th century
St. Athanasius of Alexandria

Festal Letters — St. Athanasius of Alexandria

4th century
St. Macarius the Great

Fifty Spiritual Homilies

4th century
St. Clement of Rome

First Epistle to the Corinthians — St. Clement of Rome

1st century
St. Irenaeus of Lyon

Fragments from the Lost Writings of Irenaeus

2nd century
Papias of Hierapolis

Fragments of Papias — St. Papias of Hierapolis

2nd century
St. Athanasius of Alexandria

History of the Arians — St. Athanasius of Alexandria

4th century
St. John Chrysostom

Homilies on Romans

4th-5th century
St. John Chrysostom

Homilies on the Gospel of John

4th-5th century
St. Jerome

Letters C–CLV — St. Jerome

4th-5th century
St. Jerome

Letters I–LI — St. Jerome

4th-5th century
St. Jerome

Letters LII–XCIX — St. Jerome

4th-5th century
Pope Leo the Great

Letters of Leo the Great — St. Leo the Great

5th century
St. Cyril of Alexandria

Letters on Nestorius · On the Unity of Christ

5th century
St. Athanasius of Alexandria

Letters to Serapion on the Holy Spirit

4th century
St. Basil the Great

Letters — St. Basil the Great

4th century
Eusebius of Caesarea

Life of Constantine — Eusebius of Caesarea

4th century
St. Jerome

Lives of the Monks — St. Jerome

4th-5th century
St. Basil the Great

Longer and Shorter Rules · Letters

4th century
St. John of Kronstadt

My Life in Christ

19th-20th century
Pseudo-Dionysius the Areopagite

Mystical Theology

5th-6th century
St. Gregory of Nyssa

On Virginity — St. Gregory of Nyssa

4th century
St. Athanasius of Alexandria

On the Councils — St. Athanasius of Alexandria

4th century
Pseudo-Dionysius the Areopagite

On the Divine Names and the Mystical Theology — Pseudo-Dionysius the Areopagite

5th-6th century
St. Ambrose of Milan

On the Duties of the Clergy — St. Ambrose of Milan

4th century
St. Ambrose of Milan

On the Holy Spirit — St. Ambrose of Milan

4th century
St. Basil the Great

On the Holy Spirit — St. Basil the Great

4th century
St. Basil the Great

On the Holy Spirit — St. Basil the Great

4th century
St. Athanasius of Alexandria

On the Incarnation

4th century
St. Athanasius of Alexandria

On the Life of Antony

4th century
St. Gregory of Nyssa

On the Making of Man — St. Gregory of Nyssa

4th century
St. Ambrose of Milan

On the Mysteries and On the Sacraments — St. Ambrose of Milan

4th century
St. John Chrysostom

On the Priesthood — St. John Chrysostom

4th-5th century
St. Gregory of Nyssa

On the Soul and the Resurrection

4th century
St. Gregory of Nyssa

On the Soul and the Resurrection — St. Gregory of Nyssa

4th century
St. Hilary of Poitiers

On the Trinity — St. Hilary of Poitiers

4th century
St. Cyprian of Carthage

On the Unity of the Church

3rd century
St. Gregory of Nyssa

Orations and Letters — St. Gregory of Nyssa

4th century
Metropolitan Peter Mogila

Orthodox Confession of Faith

17th century
St. Justin Martyr

Other Writings of Justin Martyr — St. Justin Martyr

2nd century
St. Justin Martyr

Other Writings — St. Justin Martyr

2nd century
Pope Gregory the Great

Pastoral Rule — St. Gregory the Great

6th century
St. Jerome

Prefaces to the Vulgate — St. Jerome

4th-5th century
Pope Gregory the Great

Register of Epistles — St. Gregory the Great

6th century
St. Gregory of Nyssa

Select Letters — St. Gregory Nazianzen

4th century
St. Gregory the Theologian

Select Orations — St. Gregory Nazianzen

4th century
St. Ambrose of Milan

Selected Ethical Works and Letters — St. Ambrose of Milan

4th century
Pope Leo the Great

Sermons of Leo the Great — St. Leo the Great

5th century
St. Athanasius of Alexandria

The Apologetic Writings — St. Athanasius of Alexandria

4th century
St. Justin Martyr

The Apologies — St. Justin Martyr

2nd century
St. Jerome

The Dialogues — St. Jerome

4th-5th century
Anonymous (Apostolic)

The Didache

1st-2nd century
St. Matthew the Evangelist

The Gospel of Matthew

1st century
St. Gregory of Nyssa

The Great Catechism — St. Gregory of Nyssa

4th century
St. Basil the Great

The Hexaemeron — St. Basil the Great

4th century
Church of Smyrna

The Martyrdom of Polycarp

2nd century
Various

The Philokalia

4th-14th century
Various

The Sayings of the Desert Fathers — The Alphabetical Collection

4th-5th century
Various (Conciliar)

The Seven Ecumenical Councils — Various

4th-9th century
St. Gregory of Nyssa

Theological Tractates — St. Gregory of Nyssa

4th century
St. Polycarp of Smyrna

Writings of Polycarp — St. Polycarp of Smyrna

2nd century
All texts St. Photius the Great

Encyclical to the Eastern Patriarchs

Ἐγκύκλιος

Address and Occasion

Photius, by the mercy of God enthroned in the Apostolic see of Constantinople and servant of the servants of God, to the most holy and blessed patriarchs of Alexandria, Antioch, and Jerusalem, and to the right honorable and Christ-loving bishops and clergy under their canonical pastoral care: grace and peace from God the Father and from our Lord Jesus Christ be with you in full measure. It is both the law of love and the ordinance of right reason, most holy brothers and co-ministers in the grace of the Holy Spirit, that those who are set as shepherds over the flock of God should keep one another informed of what concerns the household of faith, so that the healthy parts may be preserved in health and the ailing may receive prompt remedy, and that everything may be administered with prudence for the glory of God and the salvation of the faithful. For we are stewards of one and the same mystery; we serve one and the same Lord; we bear responsibility before one and the same tribunal. In this spirit, and constrained by the gravity of present circumstances, I have determined to write to your holinesses concerning matters that grieve and trouble the soul of every lover of Christ.

I would have preferred silence. There are moments when the pastor would rather keep quiet than speak of what saddens him, preferring to wait and pray and hope that things will correct themselves. But the present situation admits of no such patience. The things I am about to describe did not happen all at once, nor did they appear all together in their full enormity; they crept in gradually, each innovation clearing the way for the next, each departure from the tradition making the next departure easier. This is the method of the enemy of our souls: to introduce small changes first, so that men grow accustomed to them and their moral nerve is dulled, and then to use that dulled sensibility as a stepping stone to larger errors. Had the full extent of the corruption appeared from the beginning, even the most unwary would have recognized and rejected it. But coming by degrees, it seduced those who were not watchful, and by the time its full proportions became visible, many had already been taken in.

It is now some years since the people of Bulgaria, who for many generations had lived in the darkness of idolatry and the shadow of death, were at last illumined by the light of the Gospel through the labors of our missionaries. We baptized them, taught them the Orthodox faith, ordained priests and deacons from among their number, established churches, and gave thanks to God who had granted us this harvest. The young Church was fragile, as all new things are, but it had the foundations of the Apostolic tradition laid under it, and we had every reason to hope that in God's time it would grow strong and bear lasting fruit. Then everything changed. Into this newly planted vineyard there descended from the darkness of the West, like a destructive hailstorm falling on a field just ready for harvest, men who had neither been sent by us nor consulted us about their mission, men who came with the authority of Rome behind them and a determination to undo what we had built.

As the great Paul writes: Who is weak and I am not weak? Who is made to fall and I am not indignant? The injuries described below are not injuries to me personally, or to the Church of Constantinople, though they are that too. They are injuries to the Body of Christ, and therefore to every member of that Body. When one member suffers, all the members suffer with it. I write therefore not as a patriarch defending his territory, though I have every canonical right to do so, but as a fellow servant of Christ writing to fellow servants, asking them to recognize with me that the flock of God has been harmed, and that it falls to all of us together to seek the remedy. I make known to your beloved brotherhood what has happened, and I appeal to your canonical authority and your pastoral charity to join with us in the measures that the situation demands.

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