December 8th is the feast of the Immaculate Conception. It celebrates an important point of Catholic teaching, and it is a holy day of obligation.
There’s a popular idea that it refers to Jesus’ conception by the Virgin Mary.
It doesn’t.
Instead, it refers to the special way in which the Virgin Mary herself was conceived.
This conception was not virginal. (That is, she had a human father as well as a human mother.) But it was special and unique in another way. . . .
The Catechism of the Catholic Church explains it this way:
490 To become the mother of the Saviour, Mary “was enriched by God with gifts appropriate to such a role.” The angel Gabriel at the moment of the annunciation salutes her as “full of grace”. In fact, in order for Mary to be able to give the free assent of her faith to the announcement of her vocation, it was necessary that she be wholly borne by God’s grace.
491 Through the centuries the Church has become ever more aware that Mary, “full of grace” through God, was redeemed from the moment of her conception. That is what the dogma of the Immaculate Conception confesses, as Pope Pius IX proclaimed in 1854:
The most Blessed Virgin Mary was, from the first moment of her conception, by a singular grace and privilege of almighty God and by virtue of the merits of Jesus Christ, Saviour of the human race, preserved immune from all stain of original sin.
