We say that we are "in Christ." We say that there is "one church." We say that there is "one Body," "one Family," "one Kingdom." What is said here in Ephesians 1 is where God is headed with all this. He will unite everybody who has ever been born and makes it into His Kingdom into one—one family, the God Family—one kingdom, the Kingdom of God. The church is simply the beginning of an awesome process—a tremendous project—that will eventually cover the 50 or 60 billion people who have ever lived on the face of this earth.
We who are now begotten children of God are at the prow of the ship, as it were, cutting the water as we forge ahead. It is our calling to have gotten in on the ground floor, the very beginning of the process. We have entered the process even before all of the great men and women we have read about in the histories of the nations. They will get their opportunity, but we are way ahead of them.
Why has God had to do this? The basic cause is what happened in the Garden of Eden. Adam and Eve sinned. Sin is disruptive; it divides, and it divided our first parents away from the one Family. As Paul says in Romans 5:12, "All have sinned." We have all sinned—maybe not exactly as Adam and Eve did, but everybody has sinned. We have followed our parents in becoming separated from God. Sin divides away from God, and man from man. The world has been shattered by sin. One could say, then, that the central object of salvation is to reunite all mankind into one Family.
John W. Ritenbaugh
Unity (Part 6): Ephesians 4 (C)