@TCC-- my brother, I'd like to answer two specific points you raise-- the issue of whether God changed His purposes with man from time to time, depending on His own wisdom of the moment; and then the issue of for whose purpose the Ten Commandments were issued.
I don't think that God has ever had differences of purpose
per se; God's purpose has always been --ever and always-- to reveal Himself to mankind and, eventually, restore mankind to fellowship with Himself. Rather, the differences we note were differences in instruction, depending on where God's people were in the process of making Him known in the world.
Clearly, there was the stage when Israel itself was being created to be a nation that followed God, beginning with a man, then into a tribe, then into a nation. Then there was a stage when Israel had been formed and was learning who God was and who they were, from bondage in Egypt to freedom and existence as a physical nation in the land of milk and honey. Then came the two stages of facing their own corruption and then increasingly desperate hunger for the coming of Messiah. Then Messiah came, showed Israel what living for God truly looked like, and then died for all mankind, issuing in the start of the Kingdom of God in human beings. Then came the period when those who were saved in Israel had to be forced to take the message outside Israel, to the corners of the earth, because without that divine intervention they had been content to stay in Israel. And then, of course, came the Church Age in which believers --Jew and Gentile-- were to do what Israel had originally been tasked to do. Those are just the broadest of strokes, but in all of those stages, God's purpose never changed. All that changed were His specific methods, depending on what those with whom He was dealing needed in order to be changed into what God needed them to be in order to proceed to the next stage.
I hope that helps.
As to the Ten Commandments, while they revealed the uniqueness, the transcendence, and the majesty of God, revealing His heart and His nature, I believe they were primarily for mankind. All of them. Even the first three.
Obviously the last seven are for mankind, in that in keeping them human beings would find safety, as well as pleasantness in community. In their keeping is the structure of an ordered society and, consequently, good lives for the individual members of that society.
Yes, pastor, but how about the first two commandments? (I'll get to the third in a minute.)
Well, in order for man to regard himself properly and not elevate himself above his proper place and value in the order of things, it is important that he realize he is not the ultimate point of creation. By acknowledging the existence of God, he recognizes that there is a Being above him, to which he is accountable. And by acknowledging that there is just ONE God, mankind is saved from the foolish following of various gods and listening to various voices that would lead man away from the one true God.
And now we come to the third commandment-- to honor the Sabbath Day and keep it holy. Why is this even a commandment? On the surface it has nothing to do with loving our fellow man. Nor does it seem to be crucial in honoring God. But of course it does both. It helps us love our fellow man by giving him (and his animals, for that matter) a needed break from his labor every week. Without that rest humans' daily existence would become soulless drudgery. And then it also helps us honor God by giving us a day in which our focus can be on Him rather than on our daily lives.
But the purpose of the Sabbath is far greater in importance than even those two wonderful things. You see, the Sabbath day is a picture that God gave man of the rest he would find when Christ came. When we cease from our trying to gain salvation through our own labor and rest entirely in Christ and His labors on the Cross, we truly enter into spiritual rest. We no longer need to strive: God has done it all for us through Jesus.
This is explained in detail in Hebrews 4:1-11, the key verse being 9 which says, "There remains therefore a Sabbath rest for the people of God.’ Some translations leave out the word "Sabbath", but they shouldn't. It is there in the original Greek, in ALL manuscripts. The word is
sabbatismos (σαββατισμός) and means a Sabbath rest. This verse and its context clearly refers to entering into the finished work of salvation through Christ. There we rest from our own works, similar to how God rested on the seventh day.
This fact, explains one other strange thing about the Sabbath in the Old Testament. The only specific instruction given in the Levitical law is that we should do no work. Nowhere does it specify what constitutes work. Now, the rabbis, bless their hearts, set out to correct that divine oversight by deciding what exactly was work. They created 39
melakhot or categories of work, from building to winnowing, with each
melakha containing many specific regulations. Yet none of it is in Scripture.
Except for one thing.
In Exodus 35:3 it says, "You shall kindle no fire throughout your habitations upon the sabbath day." This is the only specific work restriction mentioned in regard to the Sabbath in the Bible. Why this? Well, it becomes very clear when you understand that the Sabbath is a picture of salvation. You see, fire in the Bible represents God's wrath and judgement. Yet Christ took all the judgement that you and I deserve. So, once you are saved, once you enter into God's Sabbath rest, there is no more judgement. As Romans 8:1 says, "Therefore, there is now no condemnation for those who are in Christ Jesus." No condemnation. None. All judgement has been dealt with on the Cross. We are free. Therefore, if the Sabbath was (as it is) to be a picture of salvation, fire had to be excluded from it. Glory to God!
Anyway, I offer those two teachings in the hope that they nourish your own studies. I pray it helps.