The mediatrix theory of the Virgin Mary being a co-mediator with Jesus between God and humanity (i.e., Mary→Jesus→Father) has a very early pedigree in the Latin or Western Catholic church. Jaroslav Pelikan makes clear that someone like Thomas à Kempis (1380–1471), a middle medieval Catholic mystic, became a popularizer of the Marian mediatrix theory. He wrote and spoke in ways that had appeal to the masses. As Protestant Christians we shirk, we shrink back at such thinking, in regard to the Mariocentrism present within the Catholic mind; as we should (biblically). Even so, it remains the case that within Catholicism the cult of Mariology remains a radically present reality for the Church’s faithful. Pelikan writes,
The absolute necessity for a qualitative distinction between Christ and Mary served as a restraint on a tendency that had already become visible in the attribution to her of the title “mediatrix,” which during this period found an eloquent spokesman in Thomas à Kempis. He called Mary “the expiator of all the sins I have committed” and “my only hope”; it was through her mediation that all mercy was granted, and through her intercession that all prayers were heard. Although Christ in his final hours of need had not sought her solace, mortals were to do so. Therefore, he said, “do not seek only Jesus,” but “Jesus at your right hand and Mary at your left.” Various titles, prerogatives, functions, and scriptural passages that had originally belonged to Christ were now by extension being “transferred” to Mary. One of the most important proof texts in the early debates over the Trinity had been Proverbs 8:22–31, who designation of personified Wisdom as supreme among God’s creatures had been a crux for orthodox doctrine; but now this passage was a reference to Mary, who was the crown of creation. Transposing the words of John 3:16, a thirteenth-century theologian could say: “Mary so loved the world, that is, sinners, that she gave her only Son for the salvation of the world.” The words of Matthew 20:28 about Christ’s giving his life for the redemption of many pertained also to Mary as, for that matter, christological proof texts such as Philippians 2:5–11, Hebrews 1:1–2, and even Matthew 11:27, pertained to Francis.
Nor was it only the function of Christ that Mary took over, but after his ascension into heaven “the Virgin remains on earth, and, together with the Holy Spirit as Comforter and Teacher, she herself becomes the comforter and teacher of the disciples.” She had been the teacher of Joseph about the details of the incarnation; and at the crucifixion, when all the disciples wavered in their faith, she alone had been “the total church and the total faith of the Christian church.”[1]
The Protestant might wonder how anyone could ever arrive at this type of Mariological doctrina. This has to do with a theory of authority and ecclesiology. Catholics, of course, maintain that the Roman Catholic Church is the only true and visible body of Christ on earth, and the Pope as her vicar. Obversely, as Protestants, it is maintained that Christ alone, along with his incarnate and glorified body, has taken His bride, His Church with Him to the right hand of the Father. The Catholic maintains, in keeping with their notion that the Catholic church is the prolongation of the incarnation on earth, that the Church receives supplemental revelation as that is provided for by the Pope’s ex cathedra representation of Christ (and Mary, for that matter) on earth. And so, Scripture is not the only or primary source of authority for the development of Catholic doctrine. Contrariwise, since the Protestant maintains that Christ is seated at the right hand of the Father, along with His body, the Church, it is the case that Holy Scripture becomes the primary witness or attestation for the Church’s reality as it instrumentally serves as the ordained spectacles by which the Holy Church encounters her authority and head in Jesus Christ (viz. in a radical theology of the Word).
There are other developments that have led to the Mariology of the Roman Catholic church (and more recent). But the primary vector that allows for it is the space the Papacy provides for the ‘development of doctrine’ (that goes beyond Scripture, which the Catholic might soften by saying: ‘in a supplemental way’). Mary for the Catholic mediates for the sinner between herself and Christ (the judge), and the Christ for us before the Father. For the Catholic, Mary becomes the lynchpin between heaven and earth, as Pelikan so perceptively noticed for us. The centraldogma, it could be said, for the Roman Catholic church, is the primacy of Mary rather than the primacy of Christ. Is this to overstate things? I don’t really think so.
5 For there is one God and one Mediator between God and men, the Man Christ Jesus, 6 who gave Himself a ransom for all, to be testified in due time, 7 for which I was appointed a preacher and an apostle—I am speaking the truth in Christ and not lying—a teacher of the Gentiles in faith and truth. –1 Timothy 2:5–7
[1] Jaroslav Pelikan, The Christian Tradition: A History of the Development of Doctrine: Reformation of Church and Dogma (1300—1700), Volume 4 (Chicago and London: The University of Chicago Press, 1977), 40.









