Albert Barnes Commentary Ephesians 6:10

"Finally, be strong in the Lord, and in the strength of his might." — Ephesians 6:10 (ASV)

Finally, my brothers, be strong in the Lord. Paul had now stated to the Ephesians the duties which they were to perform. He had considered the various relations of life which they sustained, and the obligations resulting from them.

He was not unaware that, in performing their duties, they would need strength from above. He knew that they had great and mighty enemies, and that to meet them they needed to be clothed in the panoply of the Christian soldier. He closes, therefore, by exhorting them to muster all the strength they could to meet the enemies with whom they had to contend. In the beginning of his exhortation, he reminds them that it was only by the strength of the Lord that they could hope for victory.

To be "strong in the Lord" means:

1. To be strong or courageous in His cause;
2. To feel that He is our strength, and to rely on Him and His promises;
3. To be strong in His might and in His mighty power.