There is safety for all believers in the joy of the Lord. Matthew Henry, the Puritan expositor, wrote, “The joy of the Lord will arm us against the assaults of our spiritual enemies and put our mouths out of taste for those pleasures with which the tempter baits his hooks.” The joy of the Lord is a divine armament. Those living in his joy are resistant to attacks that take others down. Resiliency marks their steps. The taste of joy renders the tempter’s offerings bland by comparison. So we see why the apostle is happy to continually urge his followers to rejoice in the Lord — because rejoicing will serve as a safeguard through all of life.
Quoted from Philippians: The Fellowship of the Gospel (Crossway Books: Wheaton, 2007.)