So the belief that Mary was purified from all sin prior to the virginal conception of Christ (either at or after her own conception) was universal?
Hello mark_sam

The Catholic Church teaches that from the very moment of her conception, the Blessed Virgin Mary was free from all stain of original sin. This simply means that from the beginning, she was in a state of grace, sharing in God's own life, and that she was free from the sinful inclinations which have beset human nature after the fall.
At the time of St Bernard of Clairvaux and St Thomas Aquinas, the data from Scripture and the Fathers was still not clear.
Additionally, the understanding of original sin was not as clear as it should have been--it was often thought of as having a positive element, instead of merely being an original lack of the grace to which God calls us. This positive element was thought to be transmitted from parents to children through the marital act (which was itself thought to be somehow sinful, though pardoned by God), and so it was hard to see how there could be an immaculate conception.
This conception had been found in some, though by no means all, of the Fathers. Now of course we know it to be false. Finally, it was not generally seen at this time how an Immaculate conception of Mary would not take away from the universality of redemption through Christ.
After a while, however, the theological tide began to turn, and the objections which had long obscured the content of divine revelation began to be overcome. This was due especially to the work of the Franciscan, Venerable John Duns Scotus. He showed that for God to preserve Mary from original sin was a greater redemption than to allow her to fall into it and then rescue her.
Blessings

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