Today it is hard to imagine how very seriously the early Church took even the most obscure theological disputes. But it is probably just as well that it did, because, through the action of the Holy Spirit in resolving these conflicts, we now have a more complete understanding of many things, especially the true nature of Jesus Christ, at once both God and man. And with a more perfect understanding of Jesus,comes a more perfect understanding of Mary, his Mother.
One of the early theological disputes centered around Mary as the Mother of God: Nestorianism, an early heresy, contended that Jesus' humanity was separate from his divinity, and that Mary was the mother of only the human Jesus. The Council of Chalcedon (451) condemned the heresy, proclaiming that Mary was the 'Theotokos,' or the 'bearer of God.'
In this presentation, Deacon Tim Elliott leads a lively discussion centered around Mary as the Theotokos, and points out how any discussion centered around Mary inevitably leads us to directly to her divine Son.
Theotokos, Part 1:
Theotokos, Part 2: