The Immaculate Conception is a Roman Catholic dogma that asserts that Mary, the mother of Jesus, was preserved by God from the stain of original sin at the time of her own conception. Specifically, the dogma says she was not afflicted by the lack of sanctifying grace that afflicts mankind, but was instead filled with grace by God, and furthermore lived a life completely free from sin. It is commonly confused with the doctrine of the incarnation and virgin birth, though the two deal with separate subjects.