Editing Pope Leo I (section)

=== Teaching on Christ ===
Leo's writings (sermons and letters) mostly discuss theological questions concerning the person of [[Jesus Christ]]
(Christology) and his role as mediator and savior (Soteriology), which is partially connected to the Council of Chalcedon, in which Roman legates represented Leo. Subsequently, through numerous letters to bishops and members of the imperial family, Leo incessantly worked for the propagation and universal reception of the faith in Christ as defined by Chalcedon, also in the eastern part of the Roman empire. Leo defends both the true divinity and true humanity of Christ against heretical one-sidedness. He takes up this topic also in many of his sermons, and over the years, he further develops his own original concepts. A central idea around which Leo deepens and explains his theology is Christ's presence in the Church, more specifically in the teaching and preaching of the faith (Scripture, Tradition and their interpretation), in the liturgy (sacraments and celebrations), in the life of the individual believer and of the organized Church, especially in a council.

To Leo the Great, Mariology is determined by [[Christology]]. If Christ were divine only, everything about him would be divine. Only his divinity would have been crucified, buried and resurrected. Mary would only be the mother of God, and Christians would have no hope for their own resurrection. The nucleus of Christianity would be destroyed.<ref>PL 54, 221, C 226</ref> The most unusual beginning of a truly human life through her was to give birth to Jesus, the Lord and Son of King David.<ref>Sermons, 9, PL54, 227, CF, and 205 BC</ref>