Why must Mary be without sin?
I’ve seen arguments that have to do with Christ cannot be in same body as sin or something like that. But we have the full divinity in us every Sunday so I don’t see need for her sinlessness.
God’s seat in the OT was upon the Ark of the Covenant.
God’s seat in the NT was in Mary.
Look at the materials the ark was made of (from Exodus 25):
10 Frame an ark of
setim wood, the length whereof shall be of two cubits and a half: the breadth, a cubit and a half: the height, likewise, a cubit and a half.
11 And thou shalt overlay it with the
purest gold within and without: and over it thou shalt make a
golden crown round about:
12 And four golden rings, which thou shall put at the four corners of the ark: let two rings be on the one side, and two on the other.
13 Thou shalt make bars also of setim wood, and shalt overlay them with gold.
14 And thou shalt put them in through the rings that are in the sides of the ark, that it may be carried on them.
15 And they shall be always in the rings, neither shall they at any time be drawn out of them.
16 And thou shalt put in the ark the testimony which I will give thee.
17 Thou shalt make also a propitiatory of the purest gold: the length thereof shall be two cubits and a half, and the breadth a cubit and a half.
18 Thou shalt make also two
cherubims of beaten gold, on the two sides of the oracle.
19 Let one cherub be on the one side, and the other on the other.
20 Let them cover both sides of the propitiatory, spreading their wings, and
covering the oracle, and let them look one towards the other, their faces being turned towards the propitiatory wherewith the ark is to be covered.
21 In which thou shalt put the testimony that I will give thee.
22 Thence will I give orders, and will speak to thee over the propitiatory, and from the midst of the two cherubims, which shall be upon the ark of the testimony, all things which I will command the children of Israel by thee.
“Setim wood” – more commonly known as the Acacia tree, means “incorruptible wood” here. [
CATHOLIC ENCYCLOPEDIA: Acacia]](
http://www.newadvent.org/cathen/01079a.htm])
The length:width ratio is almost exactly the Golden ratio (1.67 instead of 1.62)
And of course there are other obvious things that don’t need too much explanation. That’s just my speculation on the matter. I find it to be quite interesting how the two are paralleled.