Origen [185-254 AD] Commentary on the Gospel of Matthew
Now those who say so wish to preserve the honor of Mary in virginity to the end, so that body of hers which was appointed to minister to the Word . . . might not know intercourse with a man after the Holy Spirit came into her and the power from on high overshadowed her.
Lactantius [290-350 AD] The Epitome of the Divine Institutes
“We confess, therefore, that our Lord and God, Jesus Christ, the only Son of God, born of the Father before the ages, and in times most recent, made man of the Holy Spirit and the ever-virgin Mary”
Hilary of Poitiers, St [300-367 AD] On the Councils, or the Faith of the Easterns
“If they [the brethren of the Lord] had been Mary’s sons and not those taken from Joseph’s former marriage, she would never have been given over in the moment of the passion [crucifixion] to the apostle John as his mother, the Lord saying to each, ‘Woman, behold your son,’ and to John, ‘Behold your mother’ [John 19:26–27), as he bequeathed filial love to a disciple as a consolation to the one desolate”
Athanasius, St [296-373 AD] Discourse II Against the Arians
“Let those, therefore, who deny that the Son is by nature from the Father and proper to his essence deny also that he took true human flesh from the ever-virgin Mary”
Ambrose of Milan, St [340-397 AD] Letter 63
“Imitate her [Mary], holy mothers, who in her only dearly beloved Son set forth so great an example of material virtue; for neither have you sweeter children [than Jesus], nor did the Virgin seek the consolation of being able to bear another son”