I. He congratulates the Empress on the triumph of the Faith, but regrets the introduction of a new controversy into the Church.
Leo the bishop to Pulcheria Augusta.
We rejoice ineffably with your Grace that the Catholic Faith has been defended against heretics and peace restored to the whole Church through your clemency's holy and God-pleasing zeal: giving thanks to the Merciful and Almighty God that He has suffered none save those who loved darkness rather than light to be defrauded of the gospel-truth: so that by the removal of the mists of error the purest light might arise in the hearts of all, and that darkness-loving foe might not triumph over certain weak souls, whom not only those who stood unhurt but also those whom he had made to totter have overcome, and that by the abolition of error the true Faith might reign throughout the world, and “every tongue might confess that the Lord Jesus Christ is in the glory of God the Father.” But when the whole world had been confirmed in the unity of the Gospel, and the hearts of all priests had been guided into the same belief, it had been better that besides those matters for which the holy Synod was assembled, and which were brought to a satisfactory agreement through your Grace's zeal, nothing should be introduced to counteract so great an advantage, and that a council of bishops should not be made an occasion for the inopportune advancing of an illegitimate desire.
Source: Letters (New Advent)