Just how almighty and supreme is the LORD? How you view God likely will shape how you live out your life.
Paul desires to give thanks for the Ephesians that they are living complete in the LORD and that their lives are submitted to the LORD and not to the whims of this world. He knew they believed in Jesus but wanted them to have the fullness that was possible in the LORD.
So much potential for those who would live in the LORD, to fully identify with God and live in all He is able to provide. He reminds us that the same enabling that was demonstrated through Jesus is available to those ‘in’ Christ
While Paul is encouraging the disciples at Ephesus to live up to what is possible in Jesus, he goes on to emphasize just how complete the supremacy of the LORD is—not only over ALL that was created out of this world but ALL things in this created realm. ALL things, no exclusions, exceptions, ALL. And then Jesus becomes Head over those who would be filled with Him, His Body, the living Church of all in faith in Him!
God’s intention is not that the Church get by until it meets in Heaven but that it is victorious in His purposes in this world as well as the next. Rule, authority, dominion are all present enablements for the Body of Christ when in agreement with Him and exercised for His Glory alone. He is sufficient if we are submitted to Him as LORD of ALL.