“Finally, be strong in the Lord and in his mighty power.” (Ephesians 6:10, NIV)
That word, “finally,” begins an introduction to the key to success in all of the areas of life previously addressed by Paul in the preceding chapters: How to live for Christ at work, at home, with your children, with your spouse.
This key is not a strength derived from within ourselves; rather, it is a strength derived from God, Whose power — unlike our own — is always sufficient.
Paul used the metaphor of a Roman soldier’s armor kit to introduce the aspects of this “mighty power”: Truth, righteousness, the gospel of peace, faith, salvation, the word of God, and the practice of prayer for others. (Vss. 11-20)
Endeavor to live each moment of each day “armored up,” and totally reliant on God’s strength with you, for you, and within you. Doing so is a testimony to those who know not God — and an encouragement to those who do. – Luther