Today Roman Catholics and Anglicans mark the Feast of Leo the Great (Bishop of Rome, died 461). In a time of great cultural upheaval, he became known for uniting political and spiritual authorities. His writings provided the church with the language necessary to unite around common ideas about the nature of Christ at the Council of Chalcedon, and his role as a mediator in violent political conflicts helped to spare many lives. He is well known for his meeting with Attila the Hun, convincing him to hold off a few years before attacking Rome, then negotiating for less bloodshed when the Vandals later destroyed Rome.
Here is a brief passage from his Christmas Day sermon (In Nativitate Domini) titled, “Christian, Remember Your Dignity.”
“Let us then, dearly beloved, give thanks to God the Father, through His Son, in the Holy Spirit , Who
for His great mercy, wherewith He has loved us, has had pity on us: and
when we were dead in sins, has quickened us together in Christ (Ephesians 2:4-5), that we might be in Him a new creation and a new production.
Let us put off then the old man with his deeds: and having obtained a share in the birth of Christ let us renounce the works of the flesh. Christian, acknowledge your dignity, and becoming a partner in the Divine nature, refuse to return to the old baseness by degenerate conduct. Remember the Head and the Body of which you are a member. Recollect that you were rescued from the power of darkness and brought out into God’s light and kingdom. By the mystery of Baptism you were made the temple of the Holy Ghost: do not put such a denizen to flight from you by base acts, and subject yourself once more to the devil’s thraldom: because your purchase money is the blood of Christ, because He shall judge you in truth Who ransomed you in mercy, who with the Father and the Holy Spirit reigns for ever and ever. Amen.”
-Leo the Great