24 Among the obstacles to this reunion were the twelve 'Chapters' which St. Cyril had drawn up at the Synod of Alexandria, and which were rejected by the Antiochene Bishops as unorthodox because they spoke of a 'physical union' in Christ. With the utmost readiness the Patriarch, while not withdrawing or repudiating these writings - for the doctrine they contained was orthodox - nevertheless wrote several letters to explain his meaning and remove any possibility of misunderstanding, and so clear the way to peace and harmony. These explanations he gave to the Bishops, treating them 'as brethren, and not as adversaries.' 'For the sake of the peace of the Churches,' he says elsewhere, 'and to prevent them from being divided by difference of opinion, it is worthwhile to waive one's dignity.' In this way St. Cyril's charity bore in abundance the desired fruits of peace; and when at last it was granted him to see the dawn of that reconciliation, when the Bishops of the Province of Antioch had condemned the Nestorian heresy and he was able to embrace them as brothers, he exclaimed with holy joy: 'Let the heavens rejoice and let the earth be glad.' For the middle wall of partition has been broken down; that which had caused us grief is now at peace; every matter of contention has now been removed; Christ, the Savior of us all, has granted peace to His Churches.
Source: Orientalis Ecclesiae (Vatican.va)