It is funny how after I spent weeks reading the Scripture and researching the Law, finally writing out the short summary of my understanding of it in the Law of God, Law Of Moses & Law of Christ – Is There a Difference? now I find another explanation that is so similar I might have accused myself of having read his first. But the Lord knew I need to do that study upon my own and I couldn’t just take another’s word for it or start with another’s research. But yesterday I found this from A.W. Pink in his The Law and The Saint. For those that don’t see the differences in my post maybe this will help explain the differences.
The “Law of God” expresses the mind of the Creator, and is binding upon all rational creatures. It is God’s unchanging moral standard for regulating the conduct of all men. In some places “the Law of God” may refer to the whole revealed will of God, but in the majority it has reference to the Ten Commandments; and it is in this restricted sense we use the term. This Law was impressed on man’s moral nature from the beginning, and though now fallen, he still shows the work of it written in his heart. This law has never been repealed, and in the very nature of things, cannot be. For God to abrogate the moral Law would be to plunge the whole universe into anarchy. Obedience to the Law of God is man’s first duty. That is why the first complaint that Jehovah made against Israel after they left Egypt was, “How long refuse ye to keep My commandments and My laws” (Ex. 16:28). That is why the first statutes God gave to Israel were the Ten Commandments, i.e. the moral Law. That is why in the first discourse of Christ recorded in the New Testament He declared, “Think not that I am come to destroy the Law, or the Prophets: I am not come to destroy, but to fulfill” (Matt 5:17), and then proceeded to expound and enforce the moral Law. And that is why in the first of the Epistles, the Holy Spirit has taught us at length the relation of the Law to sinners and saints, in connection with salvation and the subsequent walk of the saved: the word “law” occurs in Romans no less than seventy-five times, though, of course, not every reference is to the Law of God. And that is why sinners (Rom. 3:19) and saints (James. 2:12) shall be judged by this Law.
The “Law of Moses” is the entire system of legislation, judicial and ceremonial, which Jehovah gave to Israel during the time they were in the wilderness. The Law of Moses, as such, is binding upon none but Israelites. This Law has not been repealed. That the Law of Moses is not binding on Gentiles is clear from Acts 15.
The “Law of Christ” is God’s moral Law, but in the hands of the Mediator. It is the Law which Christ Himself was “made under” (Gal. 4:4). It is the Law which was “in His heart” (Psalms 40:8). It is the Law which He came to “fulfill” (Matt. 5:17). The “Law of God” is now termed “the Law of Christ” as it relates to Christians. As creatures we are under bonds to “serve the Law of God” (Rom. 7:25). As redeemed sinners we are “the bondslaves of Christ” (Eph. 6:6), and as such we are under bonds to “serve the Lord Christ” (Col. 3:24). The relation between these two appellations, “the law of God” and “the Law of Christ” is clearly intimated in 1 Cor. 9:21, where the apostle states, that he was not without Law to God,” for he was “under the Law of Christ“. The meaning of this is very simple. As a human creature, the apostle was still under obligation to obey the moral Law of God his Creator; but as a saved man he now belonged to Christ, the Mediator, by redemption. Christ had purchased him: he was His, therefore, he was “under the Law of Christ“. The “Law of Christ“, then, is just the moral Law of God now in the hands of the Mediator and Redeemer – cf Ex. 34:1 and what follows!