Luke 1:43, where Elizabeth proclaims Mary as the “Mother of my Lord,” is usually the go-to biblical text for defending Mary “Mother of God.” But did you know there’s another text that we can appeal to?
It’s Galatians 4:4. There, Paul writes, “When the time had fully come, God sent forth his Son, born of woman, born under the law.” The key is that God’s Son is said to be born of a woman.
There are two things to unpack here.
First, assuming we accept early conciliar Christology, like that of the Council of Nicaea, God’s Son, the Word, is divine, and thus is properly called “God.”
Second, any woman who gives birth to a person is a mother to the person to whom she gives birth.
With these two things in place, we can reason as follows:
P1: Any woman who gives birth to a person is a mother to the person to whom she gives birth.
P2: Mary gave birth to God’s Son (per Gal. 4:4).
C1: Therefore, Mary is the mother of God’s Son.
P3: God’s Son is divine, and thus is properly called “God.”
C2: Therefore, Mary is the mother of God.
With the argument laid out like this, it becomes clear what a person has to deny if he wants to deny Mary as the Mother of God. Such a person would have to deny either premise one, a mother is someone who gives birth to a person; premise two, Mary did not give birth to God’s Son; or premise three, God’s Son is not Divine.
Common sense tells us that we can’t deny premise one. The very definition of a biological mother is someone who gives birth to a person. Mothers don’t give birth to anything else, like a nature or a body. The subject that is birthed is a person.
No Christian can deny premise two without denying an essential truth of the Bible, a truth that Paul makes explicit: “God sent his Son, born of a woman.”
Finally, no Christian can deny the divinity of God’s Son, the Word, lest he cease being a Christian. Recall John 1:1: “In the beginning was the Word, the Word was with God, and the Word was God.”
With a little help of reason to bring to light certain hidden premises, Galatians 4:4 provides a biblical basis for belief that Mary is the Mother of God, thereby providing another arrow in the quiver for hitting the target for this Marian dogma.
***This article was originally published in the Indulgence for Catholic Answers Magazine Online on February 7, 2025.