Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:
And hath put all things under his feet, and gave him to be the head over all things to the church,
Which is his body, the fulness of him that filleth all in all [Eph. 1:21–23].
"Paul concludes on a tremendously high note. The church is the body of Christ, and Christ is the head of the church. Someday everything is going to be under Him. The writer to the Hebrews makes it clear, “Thou hast put all things in subjection under his feet. For in that he put all in subjection under him, he left nothing that is not put under him. But now we see not yet all things put under him” (Heb. 2:8).
At the present time the only thing that is under Him is the church. By this I mean the true church, the real believers. There are many organized groups that call themselves churches but are not listening to the Lord Jesus. These churches are paralyzed. You see, the most tragic sight is a child of God lying on a bed, helpless, as if his brain is detached from his body. I’ve been in many churches that have been like that and there are many individual Christians today who act as if they are detached from Christ, the Head of the body. He says, “If ye love me, keep my commandments” (John 14:15). In other words, I can wiggle my little finger because my head is in charge of it; and when He wants you to “wiggle”—that is, exercise whatever gift He has given you—down here, you do it because of love, or else you’re not attached to Him. How important this is today! Paul pictures the church and our relationship to it in this way: “For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit” (1 Cor. 12:12–13). The thing we need to see is that Christ is the Head of the body, His church, and we are under Him."
McGee, J. Vernon: Thru the Bible Commentary. electronic ed. Nashville : Thomas Nelson, 1997, c1981, S. 5:229-230