LEX AETERNA, LEX IMMUTABILIS: The Unchanging God and the Continuity ofGiver. We establish the metaphysical foundation for all Christian doctrine in divine immutability, the attribute that guarantees God is unchanging in His character, will, and covenant promises.

We adhere to the "strong" view of immutability, which rules out all intrinsic change in God. This view alone provides the logical foundation for an essentially immutable moral law. This concept is intrinsically linked to divine impassibility, which assures us that God's love is "eternal, unalterable love" and not a reactive passion.

The apparent tension is resolved through the classical tripartite division of the comprehensive Law of Moses into three categories: moral, ceremonial, and civil. This distinction is the essential hermeneutical mechanism for understanding the continuity and discontinuity of the law in the New Covenant.

• The Moral Law (e.g., the Ten Commandments): This law is of permanent application and is unchanging because it is a direct "transcript of His character". It is the universal law revealed through natural law and codified in Scripture.

• The Ceremonial Law (e.g., sacrifices, purity regulations): These laws were typological, serving as a "shadow of Christ". They were temporary by design and became obsolete when Christ, the substance, arrived.

• The Civil Law (the judicial code for Israel): These were specific laws given for the unique nation-state of Israel and expired with the dissolution of the Old Testament economy.

Christ did not come to destroy the Law, but to "fulfill" it (plērōsai), signifying a completion of God's unchanging, pre-ordained plan of redemption. His work abrogated the ceremonial and civil "law of commandments and ordinances".

We compare how major theological systems—including Covenant Theology (which affirms continuity via the tripartite division), Traditional Dispensationalism (which views the law as one unit for Israel), and New Covenant Theology (which rejects the tripartite division but re-establishes moral norms in the Law of Christ)—approach this continuity.

Finally, we explore how a failure to correctly synthesize the immutable and temporary laws leads to the twin heresies of Antinomianism (rejecting moral obligation) and Legalism (seeking salvation through performance).

For the Christian, the immutable moral law serves a dual, grace-filled function:

1. The Pedagogical Use (Mirror): It shows us our sin and drives us to Christ for salvation.

2. The Normative Use (Guide): It acts as a "flashlight" or "lamp unto our feet," revealing the path ahead for a life of joyful, loving obedience.

Keywords: Divine Immutability, Tripartite Law, Moral Law, Ceremonial Law, Civil Law, Covenant Theology, Dispensationalism, Fulfillment of the Law, Legalism, Antinomianism, Law of Christ, Natural Law, The Decalogue.