The ninth of Maimonides' Thirteen Principles says the Torah will never be changed. The Holy One will not alter His law, nor replace Moses' law with any other. Malachi himself sealed the prophets' testimony on this point (Malachi 4:4): Remember ye the law of Moses my servant, which I commanded unto him in Horeb for all Israel, with the statutes and judgments.
But the Kabbalists, reading this principle carefully, insisted that "unchanging" does not mean "always appearing the same to us." The Torah's essence is eternal. Its garment has shifted.
Originally, the tradition teaches, the Torah wore a garment of light. It was revealed to Adam in Eden the way light is revealed to the eye that can bear it — directly, without mediation. But when Adam and Eve sinned and were clothed in kotnot or, "garments of skin" (Genesis 3:21) — the moment humanity became embodied, dense, opaque — the Torah's garment condensed with them. It became materialized, legal, narrative, the Torah of earth rather than the Torah of fire. The same Torah, but clothed now in the medium that mortal eyes could read.
In the future, the Kabbalists say, after the redemption, the garment of light will be restored. The Messiah will preach the Torah in terrible mysteries — not new law, but the same law revealed without its layer of skin. What is a narrative now will be a blaze then. What reads as legal prose will flame as theophany.
The Torah has not changed. Only the thickness of the glass through which we read it has changed, and in the end even the glass will be removed.