Thanks Joab
In reading this, I find it interesting that it states that Mary was given this grace and shown such favor by God even before she accepted the angel's word or could do anything to earn it, yet it is such a odd thing when we say God does the same for His elect. This does make Mary's regeneration before she could accept Christ in thetraditional sense more easily understood.
Also, I can understand Mary being shown this grace before conception but I still see no need that she be sinless. The material cites Samson's mother not consuming unclean things as an example, but those things are taken in by the body and would have been transferred through the blood to the child, sin is ones life is not active in the body in the same manner.
Think of it in human terms. What would you do for your own mother? About anything right?
Now consider God and what He would do for who He chose for His fleshly mother.
Adam and Eve were sinless when created. Our fallen nature is handed down from their fall.
Now Jesus and Mary are our new Adam and our new Eve.
It is also fitting that they would be sinless to remove that debt of original sin.
Jesus by virtue of being God Himself and Mary as a privilege of her Fiat or saying yes always to Gods will.
You see Jesus was utterly incapable of sin. Mary was not, however as a special grace of God was preserved of the stain of original sin for Christs sake and there after always did Gods will.
Though Jesus had no human father He did have a human Mother and Jesus shared her DNA. A mother who had to be the antithesis to the disobedience that over took Eve.
I know its an odd think. Its unique in salvation history. Our salvation through Jesus was a once and for all occurrence just as there was one sin of Eve that incurred the fall and one Mary or new Eve who did not.
Its important to realize we do not attribute this special grace given to Mary to glorify her humanity but to glorify the Lord and His promises.
Beyond this, Mary was a susceptible to sin as we are yet we know that we too can persevere in grace and remain sinless if we, like Mary, our greatest human example, always choose to do Gods will.
We all are capable of cooperating with grace.
Peace brother.