Gregory the Great
Catena Aurea · Matthäusevangelium 12
While he yet talked to the people, behold, his mother and his brethren stood without, desiring to speak with him. Then one said unto him, Behold, thy mother and thy brethren stand without, desiring to speak with thee. But he answered and said unto him that told him, Who is my mother? and who are my brethren? And he stretched forth his hand toward his disciples, and said, Behold my mother and my brethren! For whosoever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother.
(Hom. in Ev. iii. 2.) The Lord deigned to call faithful disciples His brethren, saying, Go, tell my brethren. Since then a man may be made a brother of the Lord by coming to the faith, it should be enquired how one may become also His mother. Be it known by us then, that he that by believing is made brother or sister of Christ, becomes His mother by preaching; for in pouring Him into the heart of the hearer, he may be said to beget the Lord; and he is made the Lord’s mother, when by his word love of the Lord is begotten in the mind of his neighbour.