Original sin is not part of human nature. Think about it… Adam was human without Original Sin, right?
In the beginning, God made man with three kinds of gifts:
- human nature or “natural gifts”
- Supernatural gifts
- Preternatural gifts
Because of Adam’s sin, he lost all but gift #1 (human nature). His human nature did not substantially change. What changed was the lack of other gifts which served to intrisically “elevate” his human nature. Nonetheless, he only lost gifts #2 & #3, but retained his original human nature (gift #1).
We inherit gift #1–human nature–by virtue of natural generation. Jesus inhereted this gift too, as he was born of Mary. We did not inherit gifts #2 nor gift #3
by natural generation. Neither did Mary or Jesus inhereit these gifts by natural generation.
Gift #2 includes sanctifying grace. That we lack gift #2 when we are made is called “original sin,” because we lack the original justice that Adam had been given when they were made.
Although Mary did not receive gift #2 by natural generation, she did received it by Divine supernatural intervention. She was “born from above” at conception.
Jesus did not receive gfit #2 by natural generation. Why? Because He is the Gift-giver. He is Divine and required no such gift. Thus, he was indeed
without original sin as he
did not lack sanctifying grace.
And yet, Jesus and Mary differed in the manner in which they possessed sanctifying grace. Mary possessed it in such a way that she was
not impeccable. She could have sinned, yet didn’t. Mary, like all the saints, was made impeccable when she came into the presence of the Beatific Vision in heaven.
Jesus, on the other hand, ALWAYS possessed the Beatific Vision in its perfection. Thus, Jesus was impeccable.