“The Lord has redeemed us through His own blood, giving His soul for our souls, His flesh for our flesh. He has poured out the Spirit of the Father for the union and communion of God and man. He has truly given God to men by means of the Spirit. And He has brought man to God by His own incarnation. At His coming, he has given us lasting and true immortality by means of communion with God. Before these truths, all the doctrines of the heretics fall to ruin.”
(St Irenaeus of Lyon, ‘Against the Heresies’)