This chapter extols the uniqueness of the church, which Paul refers to as "the purchased possession." Israel became God's personal possession through the destruction of Egypt, and more importantly, with the killing of Egypt's firstborn as the price for Israel's liberty. God "purchased" Israel and its liberties by this means.
What we see taking form is a separate and unique people. Even though all mankind owes its existence to God as their Creator, Israel and the church are both separate and unique because they belong to God in a way other people and nations do not. Amos 3:2 declares, "You only have I known of all the families of the earth." God purchased these people at awesome cost and thus came into possession of them.
When Israel became His property, it gave them certain liberties. So it is with us, but we receive more besides. Among other things regarding the uniqueness of the church, Paul explains that its members have been set apart (redeemed and freed from the rest of mankind and its ways) and sealed through the gift of the Holy Spirit.
The term sealed is important because it embraces, not only the sense of ownership, but also security and guarantee. Individual seals were unique, used on documents to identify the sender and to render the content secure from prying eyes and theft, and so they were a guarantee that the contents would reach the intended destination.
God's children may look no different on the outside, but they have been given something inside, something spiritual, that makes them different from others and special to God. They are different only because of something God has done, which also makes them His personal, treasured possession.
John 1:12-13 declares, "But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name: who were born not of blood, nor of the will of the flesh, nor of the will of man, but of God." That "something" is the right or power (KJV) to believe the Word of God, which opens our minds and imparts to us the knowledge of God and His purpose, faith, the fear of God, the love of God, and so much more.
Billions of people have access to the Bible. They read it and may even attend church and call themselves Christian, but they then ignore and disobey huge amounts of it, thus not living by every Word of God. This is actual evidence that those who are part of God's special treasure do indeed possess something that sets them apart and motivates them to obey more completely.
Deuteronomy 7:6 begins a section that reveals one of the major reasons why God has done this. "For you are a holy people to the LORD your God; the LORD your God has chosen you to be a people for Himself, a special treasure above all the peoples on the face of the earth." Segullah appears again as "special treasure," but along with segullah is another, more familiar term that identifies being a special treasure as an aspect of a larger subject: the blessings and responsibilities of holiness.
Holy literally means "set apart." Being a special treasure has set us apart from other people. Others, without this advantage, are not set apart. When this principle from the Old Testament is combined with Ephesians 1:13-14, we can understand that the blessing of having the Spirit of God makes us special, different, and holy (Romans 8:9).
This occurs because, in God's self-revelation, His Spirit imparts faith and the love of God beyond what the natural mind is capable. It is becoming clear that being blessed as a special, holy people imposes responsibilities on us that we are required—indeed commanded—to meet. The standards within this relationship are high, requiring gifts and growth to meet them.