Saint Hilary of Poiters, Hymn on Christ 11-13, CSEL 65, 218:
Gabriel pronounces; Christ is received into the Virgin's body. The womb swells because of the holy Offspring. We are exhorted to believe in something new, and never seen before: A childbearing Virgin.
From Saint Hilary of Poiters (+ 367 A.D.), the "Athanasius of the West." Saint Hilary was the most tenacious and formidable Western adversary of Arianism.
O Christ, for us the twice-born God! Born once, from God unborn; Born twice, when the childbearing Virgin Brought you into the world, Embodied and still God!Hymns 1, 5-8; Corpus scriptorum ecclesiasticorum latinorum (CSEL) 65, 209