25 What worthy return can we make for so great a condescension? The One Only-begotten God, ineffably born of God, entered the Virgin's womb and grew and took the frame of poor humanity. He Who upholds the universe, within Whom and through Whom are all things, was brought forth by common childbirth; He at Whose voice Archangels and Angels tremble, and heaven and earth and all the elements of this world are melted, was heard in childish wailing. The Invisible and Incomprehensible, Whom sight and feeling and touch cannot gauge, was wrapped in a cradle. If any man deem all this unworthy of God, the greater must he own his debt for the benefit conferred the less such condescension befits the majesty of God. He by Whom man was made had nothing to gain by becoming Man; it was our gain that God was incarnate and dwelt among us, making all flesh His home by taking upon Him the flesh of One. We were raised because He was lowered; shame to Him was glory to us. He, being God, made flesh His residence, and we in return are lifted anew from the flesh to God.
Source: On the Trinity (New Advent)