What is meant by the Law of God anyway?

"The term 'law' in Scripture is to be understood either in an extended or in a restricted sense.
In its extended or large acceptance, it is used sometimes to signify the five books of Moses (Luke 24:44), at other times all the books of the Old Testament (John 10:34), sometimes the whole Word of God in the Scriptures of the Old and the New (John 1:17), in others the Old Testament dispensation, as including prophecies, promises, and types of Messiah (Luke 16:16; Hebrews 10:1) and in several the doctrine of the gospel (Isaiah 2:3 and 42:4).
In its restricted or limited sense, it is employed to express the rule which God has prescribed to His rational creatures in order to direct and oblige them to the right performance of all their duties to Him. In other words, it is used to signify the declared will of God, directing and obliging mankind to do that which pleases Him, and to abstain from that which displeases Him.
This, in the strict and proper sense of the word, is the law of God; and it is divided into the natural law and the positive law. The natural law of God, or the law of nature, is that necessary and unchanging rule of duty which is founded in the infinitely holy and righteous nature of God. All men, as the reasonable creatures of God are, and cannot but be, indispensably bound to it. The positive law of God comprises those institutions which depend merely upon His sovereign will, and which He might never have prescribed and yet His nature always continued the same; such as the command not to eat of the forbidden fruit; the command during the period of the Old Testament dispensation to keep holy the Sabbath of Jehovah, the seventh day of the week, which under the New Testament is altered to the first day; the ceremonial law given to the Israelites which prescribed the rites of God's worship, together with many of the precepts of their judicial law; and the positive precepts concerning the worship of God under the gospel." - John Colquhoun, A Treatise on the Law and Gospel


The interesting aspect of the law of nature is that it is good, holy, and just. However, the positive law is good, holy, and just because God commanded it. I am reminded of what Gordon H. Clark says that a thing is right just because God commands it.