XIII It is suggested that the matters depend only on reading the New Testament, not anything in the Old.

List of claims

In fact, many of the Catholic beliefs contested by Protestants here have an OT history.

Was the mother of a Jewish king queen? That cannot be checked in NT, it has to be checked in OT.

Would the words of Elisabeth refer to Genesis 3:15? Would Christ's repeated use of "woman" to His mother refer to Genesis 3:15? Well, if so, you must check what Genesis 3:15 actually says ... and that involves going to the old Testament.

On Petrine claims of papacy, what do "keys of the kingdom" mean in Old Testament? What does "bind and loose" mean in Rabbinic (not yet apostasised) Jewish custom?

Again, we must look to the Old Testament about this. And furthermore, so much in the Old Testament is typologically prophetic about the New Testament. Actually, this is in and of itself an argument for the need of unbroken Apostolic tradition, since the OT does not specify exactly when, where and how each part of it is fulfilled as prophecy in NT, and since the NT has so much to tell over and above the OT, is shorter than it and therefore obviously also does not contain a full Christian exegesis of OT.

However, that this typology exists legitimately in NT is brought forth not just by sparse hints here and there on some one topic, weighty as it may be, but also by this:

"And beginning at Moses and all the prophets, he expounded to them in all the scriptures, the things that were concerning him."
[Luke 24:27]

"And he said to them: These are the words which I spoke to you, while I was yet with you, that all things must needs be fulfilled, which are written in the law of Moses, and in the prophets, and in the psalms, concerning me."
[Luke 24:44]

And by this and this:

"And when they had appointed him a day, there came very many to him unto his lodgings; to whom he expounded, testifying the kingdom of God, and persuading them concerning Jesus, out of the law of Moses and the prophets, from morning until evening."
[Acts Of Apostles 28:23]

"But being aided by the help of God, I stand unto this day, witnessing both to small and great, saying no other thing than those which the prophets, and Moses did say should come to pass:"
[Acts Of Apostles 26:22]

This means that there is lots of OT exegesis the Apostles had from Christ and it is too vast to be accessible in full from the NT scriptures alone. Therefore, there is a part of tradition which is involved with OT exegesis, and it is very relevant to the topics here at hand. Obviously, purgatory or at least praying for the dead is a somewhat easier topic to handle from OT even without typology : since purgatory existed back then too and since souls could be transferred from purgatory to bosom of Abraham just as they now can be and eventually all remaining are transferred from purgatory to heaven.

Hans Georg Lundahl
Nanterre UL
St. John of Matha
8.II.2019