Our identity as a believer rests in our realization of who we are in Christ. Our insufficiency is replaced with His sufficiency. We are complete in Him and are seated with Him above (having authority and dominion over) every principality and power.
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. 2 Corinthians 5:17-19 KJV