Remember Paul prayed that both we and the Ephesians might have the spirit of wisdom and revelation in the knowledge of Him, the eyes of your understanding being enlightened; that you may know what the hope of his calling, what are the riches of the glory of His inheritance in the saints, what is the greatness of His power” Ephesians 1:17-19.
And then notice the power of which he speaks. It is defined for us in v. 20 as that which raised Christ from the dead. It was His mighty power that raised Christ from the dead. But the real message for us in this passage is, as Christians, we have that same power working in us. Now if God raising Christ from the dead is a demonstration of Great Power, and it was, He is telling us through Paul, guided by the Holy Spirit, that same power is available to us.
Now God wasn’t finished with Christ at this point, He exalted Him seating Him at His right hand “in the heavenly places, far above all principality and power and might and dominion and every name that is named, not only in this age but also in that which is to come.” Vs.20,21.
Another part of that exaltation was putting all things under His feet...He is Lord of all --- heaven, earth, hades, hell, angels, governments, and all. Matthew 28:18; 1 Timothy 6:15.
He is also head of the church. Probably one of the most important thoughts here is that simple fact. He is “head over all things to the church”. Ephesians 1:22 The idea of fulness signifies that which is filled. The church is filled (not just an allotted sample) by Christ with blessings and salvation. And being head of the church He is the final authority. There is no council, synod, assembly, board of men who can suppose to make laws or rob Christ of His authority. Surely the most important thing we can do in obedience to Christ is to acknowledge that authority. And probably, in our time, the thing most notably missing is the recognition of that authority. Especially in its worship, its laws, its plan of salvation, its moral standards.
Christ has only one body, (Ephesians 4:4) thus there is one head and one body (Romans 12:4) And Paul says we are all members of one body
Scripture for follow up
1 Timothy 6:15