At the time appointed by God, the only Son of the Father, the eternal Word, that is, the Word and substantial Image of the Father, became incarnate; without losing his divine nature he has assumed human nature.
Jesus Christ is true God and true man, in the unity of his divine person; for this reason he is the one and only mediator between God and men.
Jesus Christ possesses two natures, one divine and the other human, not confused, but united in the one person of God’s Son.