This reminds me of the absolutely OLDEST reason and Scriptural basis for the belief in Marys Immaculate Conception!! I first recognized it in my PROTESTANT NKJV Jon McAuthur study Bible. In Luke 1:28, whenever the angel Gabriel says, “Rejoice, highly favored one,” McAuthor, a PROTESTANT Bible commentator, was quick to point out that “highly favored one,” in the Koine Greek literally means, “Full of grace.” He was then quick to say, “This portrays Mary as a recipient, not a dispenser of grace.” And thats exactly correct. (She is also, however, also a despensor of grace, since she literally dispenced from her womb Grace Himself.)

But I believe it was St. Augustine who made the point that, “And when there is talk of sin and Our Lady, there shall be none, for the Scriptures call her “full of grace,” and how much grace are we to say that God has given her?” And he’s exactly right. No one can sin in a state of grace.