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.
(Lib. de Vita Moysis.) For the tables of our nature which guilt had broken, the true Lawgiver has formed anew to Himself from our dust without cohabitation, creating a body capable of taking His divinity, which the finger of God hath carved, that is to say, the Spirit coming upon the Virgin.