“Why Marian dogma at all?” Why not just dogmas about Christ and let Catholics think what they like about Mary?..
The answer is that Catholics…sometimes…think deeply erroneous things. When they do, and that thought imperils some revealed truth to the point it threatens the integrity of the Church’s witness, the Church will, from time to time, define its doctrine more precisely…
The dogma of the Theotokos is a commentary on Jesus…Just as Nestorianism had tried to attack the orthodox teaching of Christ through Mary…now the Church protected that teaching about Christ by making Theotokos a dogma. That is a vital key to understanding Marian dogmas: They’re always about some vital truth concerning Jesus, the nature of the Church, or the nature of the human person.
This is evident, for instance, in the definition of Mary as a Perpetual Virgin…Why a dogma about it? Because, again, Mary’s life is a referred life. Her virginity…speaks of her total consecration to God and of our call as Christians to be totally consecrated as well…
Given that Marian dogma is always a commentary on Christ and His Church, what is the Church saying in its dogmatic teaching that 1) Mary was preserved at the moment of her conception from the stain of all sin, both original and actual; and 2) Mary was assumed bodily into heaven at the end of her earthly existence?
The great crisis that faced the Church in the 19th century…was the rise of several ideologies…that called into question the origins and dignity of the human person. Darwin said the human person was an unusually clever piece of meat…Marx said humans were mere ingredients in a vast economic historical process. Laissez-faire capitalism saw people as natural resources to be exploited…Eugenics said human dignity rested on “fitness.” Much of Protestantism declared humans “totally depraved,” while much of the Enlightenment held up the myth of human innocence… Racial theory advanced the notion that the key to human dignity was the shape of your skull, the color of your skin, and your membership in the Aryan or Teutonic tribe. Freud announced that your illusion of human dignity was just a veil over fathomless depths of unconscious processes largely centering in the groin…
All these ideologies…had in common the degrading rejection of human beings as creatures made in the image of God and intended for union with God (and the consequent subjection of the human person to some sort of creature). In contrast to them all, the Church, in holding up the icon of Mary Immaculate, held up an icon of both our true origin and our true dignity. …Why did the Holy Spirit move the Church to develop and focus this immemorial teaching more clearly?
Because what needed to be said loud and clear was that we were made in the image of God and that our fallenness, though very real, does not name or define us: Jesus Christ does. We are not mere animals, statistical averages, cogs in a machine, sophisticated primordial ooze, or a jangling set of complexes, appetites, tribal totems, Aryan supermen, naturally virtuous savages, or totally depraved Mr. Hydes. We were made by God, for God. Therefore sin, though normal, is not natural and doesn’t constitute our humanity. And the proof of it was Mary, who was preserved from sin and yet was more human than the lot of us…
The 19th-century ideologies didn’t, however, remain in libraries and classrooms. In the 20th century, they…bore abundant fruit in such enterprises as global and regional wars, the Holocaust, the great famines, the killing fields, the “great leap forward,” the sexual revolution, and the culture of death, which is still reaping a rich bounty of spiritual and physical destruction. In short, as the 19th-century philosophies assaulted the dignity and origin of the human person, so the working out of those philosophies on the ground in the 20th century assaulted the dignity and destiny of the human person.
So what did the Holy Spirit do? Once again, in 1950, in the middle of a century that witnessed the biggest assault on the human person and on the family that the world has ever seen, the Church again held up Mary as an icon of who we really are and who we are meant to become by promulgating the dogma of the Assumption of Mary. Just as the Immaculate Conception held Mary up as the icon of the divine dignity of our origins, so the Church, in teaching “that the Immaculate Mother of God, the ever-Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory” was now holding her up as the icon of the divine dignity of our destiny.
The Church is repeating, in effect, that the God Who loves the world does not will that our fate be the oven, the mass grave, the abortuary, the anonymity of the factory, the brothel, the cubicle, or the street. The proper end of our life is supposed to be for us, as it already is for her, the ecstatic glory of complete union with the Triune God in eternity. Once again, God shows us something vital about our relationship to Himself through her, His greatest saint.