"Put on the full armor of God, so that you will be able to stand firm against the schemes of the devil. For our struggle is not against flesh and blood...Stand firm therefore, having belted your waist with truth, and having put on the breastplate of righteousness..." (Ephesians 6:11–12, 14)
The account of David and Goliath offers insight into donning the armor of God. King Saul tries to discourage David by saying he was but a boy and Goliath a seasoned warrior from his youth. That’s like us being discouraged when the enemy taunts us; “You’re just a weak human; demons and fallen angels are powerful and have been causing destruction for thousands of years! You cannot prevail against us!”
David recounts being rescued from the lion and bear and states with confidence that God will rescue him from the giant Philistine.
Likewise, we can say, “Adonai, who rescued me from sin and death, will rescue me from the hand of Satan.” We will prevail because Jesus already won the victory at Calvary.