Ephesians 6:10

Finally - Having laid before you, your great and high calling, and all the doctrines and precepts of the Gospel, it is necessary that I should show you the enemies that will oppose you, and the strength which is requisite to enable you to repel them.

Be strong in the Lord - You must have strength, and strength of a spiritual kind, and such strength too as the Lord himself can furnish; and you must have this strength through an indwelling God, the power of his might working in you.

Finally, my brethren, 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 the discharge of their duties they would need strength from above. He knew that they had great and mighty foes, and that to meet them, they needed to be clothed in the panoply of the Christian soldier. He closes, therefore, by exhorting them to put on all the strength which they could to meet the enemies with which they had to contend; and in the commencement 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," is:

(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.

6:10 Brethren - This is the only place in this epistle where he uses this compellation. Soldiers frequently use it to each other in the field.Be strong - Nothing less will suffice for such a fight: to be weak, and remain so, is the way to perish. In the power of his might - A very uncommon expression, plainly denoting what great assistance we need as if his might would not do, it must be the powerful exertion of his might.