Gregory of Nyssa
Catena Aurea · Lukasevangelium 1
Then said Mary unto the angel, How shall this be, seeing I know not a man? And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
(Orat. in Diem Nat. Christi.) Hear the chaste words of the Virgin. The Angel tells her she shall bear a son, but she rests upon her virginity, deeming her inviolability a more precious thing than the Angel’s declaration. Hence she says, Seeing that I know not a man.