"True humanity and true divinity combine so that in Christ man and God they are combined into one person, our Lord Jesus Christ". With these words, spoken off the cuff, the Pope explained the "first great triumph of devotion to Mary", which saw Cyril opposed to Nestor and which ended with the latter’s exile, "because of a wrong Christology", which was wrong because it was based on intolerable "divisions within Christ Himself". Two or three years after having been appointed bishop of Alexandria by Leo XIII (in 412), Cyril mentioned the Pope "proved a realist in mending the division of the communion from Constantinople", which had been going on since 406. But the old contrast with Constantinople’s See flared up again about ten years later, when in 428 the See was taken by Nestor, "an authoritative and strict monk of the Antioch’s school", who "soon aroused contrasts, because in his preaching he preferred to call Mary ‘Christ’s Mother'(Christotòkos) instead of the traditional name already beloved by people of ‘God’s Mother’ (Theotòkos)". Cyril of Alexandria, added the Holy Father, also off the cuff, combines "the clarity of the doctrine of our faith with an intensive quest for unity and reconciliation", starting from the central statement that "one is the Son".
