“We accept that the Word of God truly became man, not by the will of a man and woman, as the heretics say, but in conformity with what the Gospel says: “He became man by the Virgin and the Holy Spirit”, and that this happened not in appearance but in reality. He became man of the Virgin, and you must now listen to the exposition of this doctrine and accept the proofs for it, because the heretics make many errors about this topic.”Cyril of Jerusalem, Catecheses 12, 3; PG 33, 728 C-729 A.
Gambero, L., 1999. Mary and the Fathers of the Church 1st ed. Translated by Buffer, T., San Francisco: Ignatius Press. p. 134.