Athanasius stood contra mundum ("against the world") in defense of the biblical doctrine of Christ. He opposed Arius when it seemed all the world would follow Arius's heresy. Athanasius's work remains even today one of the definitive statements of orthodox Trinitarianism.

• Against Heresies
• On Acquisition of the Holy Spirit
• The Didache
• The Early Church - From Ignatius to Augustine (Illustrated)
• On Grace and Free Will