The Immaculate Conception of Mary is one of the four Marian dogmas of the Catholic Church. Defined by Pope Pius IX in Ineffabilis Deus, 1854, it states that Mary, through God’s grace, was conceived free from the stain of original sin through her role as the Mother of God.
About Immaculate Conception in brief

The mother of Mary, not a biblical character, first appears in the late 2nd-century Protevangelium of James, which names her Anne, probably from Hannah, the mother of the prophet Samuel. Mary is conceived and born, and, like Samuel, is taken to spend her childhood in the temple, but the story does not advance the idea of an immaculate conception. Nevertheless it was not theological discussion of Mary’s curse that initiated the theory that her conception was free from mankind’s sin. In eleventh century, the popular liturgy for the popular feast of Mary brought forth the objection that Mary’s conception brought forth as normal human conception was sinful, to celebrate a sinful event. In 1431, St. Bernard of Clairvaux and Thomas Aquinas, among others, objected that if Mary were free from original sin at her conception then she would have no need of redemption, making Christ superfluous. They were answered by Duns Scot, who reasoned that preservation from originalSin was a redemption more perfect than that granted through Christ. Nevertheless, it was still argued that her birth was not a sin, but a gift from God to the world. In 1545, Mary’s mother, Anne, told how she had been conceived through a vision of her daughter’s sexual union with her husband, and that Mary had also been conceived free of sin through the act of sexual desire.
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