As Paul says, he comes to his final appeal to these believers. He has given them a great promise of glory in heaven with Christ forever. He has shown them they have a wonderful acceptance and standing with God through Christ. He has prayed for their spiritual strength and enrichment as they fellowship with Christ. He has urged them to live their lives showing the value of their salvation. Now, he calls believers to stand strong. Paul knew all too well that there is a battle we Christians are engaged in. Please reread what I just said! We ARE IN A BATTLE! Problem is: too many Christians seem oblivious to this truth. Spiritual warfare is real and Paul wants believers to recognize it!
I'm not one for outlines, but I could say verse 10 gives the call of God to stand strong. Verses 11-12 speak of the enemy we are against. Verses 13-17 describe the Armor of God every Christian should be wearing. Verses 18-20 speaks of the battle we're in. Being that I am a devotional commentator, I'm not necessarily going to follow this, but I'll relate to it over the next few days.
Ephesians 6:10 is Paul's way of closing this letter with a strong appeal for believers to recognize they are in a battle and they are the part of the prime target the enemy is aiming at. Satan wants to attack humanity overall, keeping as many lost people lost. When a person gets saved then the enemy's strategy is to nullify their effectiveness by attacking them with spiritual warfare against their walk with Christ and will not shy away from attacking them physically if he can.
Paul calls Christians to "be strong in the Lord and in His mighty power." He knows that no Christian is strong enough in their own strength to face the enemy of their souls. They need to find their strength in Almighty God who gives them power through His Spirit. Remember Acts 1:8 NKJV, "But you shall receive power when the Holy Spirit has come upon you..." Power comes from God and can only be gained by relying on the Spirit of God to work through a yielded and obedient Christian. Pay attention to what Paul says as we discuss this over the next few days.