Church Fathers

Witness to apostolic succession and ecclesial harmony at the end of the 1st century.

Reference: 1 Clement

Letters urge unity with the bishop and speak of the Eucharist as the flesh of Christ.

Reference: Letters of Ignatius

First Apology describes Sunday liturgy: readings, homily, prayers, Eucharist.

Reference: First Apology 65–67

Emphasizes apostolic tradition, the goodness of creation, and recapitulation in Christ.

Reference: Against Heresies

Brilliant apologist; later rigorism. Still foundational for Latin theology.

Reference: Apology; Against Praxeas

Taught the episcopate’s unity and the necessity of ecclesial communion.

Reference: On the Unity of the Church

On the Incarnation: God became man that man might become God (by grace).

Reference: On the Incarnation

With Gregory Nazianzen and Gregory of Nyssa, clarified Trinitarian doctrine.

Reference: On the Holy Spirit

Theological Orations remain classics of orthodox Christology and Triadology.

Reference: Theological Orations

Homilies on Scripture; fierce charity toward the poor; Eucharistic devotion.

Reference: Homilies; Divine Liturgy of St. John Chrysostom

Defended Church freedom; taught on sacraments and virginity.

Reference: On the Mysteries; hymns

“Ignorance of Scripture is ignorance of Christ.” Patron of biblical studies.

Reference: Vulgate; Letters

Shaped Western theology on Trinity, original sin, grace, and the Church.

Reference: Confessions; De Trinitate; City of God

Christological precision: one incarnate nature/Person of the Word.

Reference: Council of Ephesus (431)

Affirmed two natures in one Person; strengthened Roman primacy.

Reference: Tome to Flavian; Sermons

Pastoral Rule; Gregorian mission to England; chant tradition associated with his name.

Reference: Pastoral Rule; Dialogues