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Thank you so much for your reply and question, dear trad_anglican!

Then what does that make every book written after this one? And wouldn't such a broad interpretation of this statement place all Christians under the Mosaic law?

If a person believes that the prophets and writings (Old Testament books which followed the Torah) - along with the New Testament books are the words of men and not the words of God, then he would have to ignore them all based on Deuteronomy 4:2

Ye shall not add unto the word which I command you, neither shall ye diminish [ought] from it, that ye may keep the commandments of the LORD your God which I command you. – Deuteronomy 4:2

But we Christians already know that Jesus Christ is God and that He is the Word of God.

In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men. – John 1:1-4

And we know that He quoted the Torah, the prophets and the writings - in many places, and notably in every response to the temptations of Satan, He said "It is written."

Moreover, we Christians know the words of God when we hear them - we cannot be fooled.

To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out. And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice. And a stranger will they not follow, but will flee from him: for they know not the voice of strangers. – John 10:3-5

The people Jesus is addressing in the following passage were physically hearing Him (pressure or sound waves) but they could not spiritually hear Him because they did not have "ears to hear:"

Why do ye not understand my speech? [even] because ye cannot hear my word. – John 8:43

"Ears to hear" are a gift of God. If signs and reasoning were enough, the Hebrews (and Egyptians, btw) would have all believed:

And Moses called unto all Israel, and said unto them, Ye have seen all that the LORD did before your eyes in the land of Egypt unto Pharaoh, and unto all his servants, and unto all his land; The great temptations which thine eyes have seen, the signs, and those great miracles: Yet the LORD hath not given you an heart to perceive, and eyes to see, and ears to hear, unto this day. And I have led you forty years in the wilderness: your clothes are not waxen old upon you, and thy shoe is not waxen old upon thy foot. - Deuteronomy 29:2-5

Ditto for the Greeks:

For the Jews require a sign, and the Greeks seek after wisdom: But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness; - I Cor 22:23

God's Name is I AM.