Finally, my brethren, be strong in the Lord, and in the power of his might. 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.