St Irenaeus, the most important theologian of the second century, lays the foundation for all future Christian thinkers. Here he recounts all the various deeds of God, culminating in the exaltation of His crucified Son, Jesus Christ, and the bestowal of His Holy Spirit and the gift of a new heart of flesh.

• On the Unity of Christ
• On God and Christ: The Five Theological Orations and Two Letters to Cledonius (St. Vladimir's Seminary Press: Popular Patristics)
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