The Shield of Faith
16above all, taking up the shield of faith, with which you will be able to quench all the fiery darts of the evil one. Ephesians 6:16
While at war with the Enemy of God, it is vital to not only have offensive weapons but a good defense as well.
Paul tells believers to receive the shield of faith "over all."
This word "επι" means upon or over.
It refers not to a summation of the armor, but rather to the positioning of the shield. It covers all these things, i.e., the rest of the armor. It fully protects the entire believer's body from "the fiery darts of the evil one."
It is also important to note that the word "which" agrees gramatically with "shield" and not "faith." It is the shield which will quench them. It is not simply any kind of faith but rather the shield of faith—that which we receive from the Lord by being strong in Him.
Apart from our identity in Christ, we have no power against the enemy. We were sold to him for our sin and have no authority to resist him. We are slaves to him unless and until we ratify the redemption Yahweh paid through the Blood of His Son. When we choose to put our faith in Him, receiving Him and entering Him, we are brought out from the authority of Satan into the Kingdom of Yahweh.
Therefore, we may receive this shield of faith to resist the Devil, by being strong in the Lord and the power of His might.
The armor has been given to us to withstand the "wiles of the Devil."
11Put on the whole armor of God, that you may be able to stand against the wiles of the devil. Ephesians 6:11
This word for wiles, μεθοδειας, is the Greek word from which our word "method" comes. It comes from two other Greek words meaning "with" and "travel." This word is also used in connection with error:
14that we may no longer be children, tossed back and forth and carried about with every wind of doctrine, by the trickery of men, in craftiness, after the wiles of error; Ephesians 4:14
Here it is "methods of error." The Greek word for error, πλανης, is a form of the Greek root word from which we get our word "planet." That root means wanderer. Here, we see that the gifts of ministry were given to prevent God's people from caught up in, among other things, the methods of wandering; this is exactly how Satan works. He deceives us by giving us substitutes for obeying God.
The Lord's Defense
Christ Jesus exemplified the perfect use of the shield of faith in His confrontation with Satan. As one of his wiles is, the Devil came to attack the Lord immediately following the Lord's 40-day long communion with the Father in the Spirit (Matthew 4:1-3).
Here Satan is called προσελθων, "Tempter." The root word for this term means to pierce or to cross over, more specifically to objectively test, prove or examine. The manner in which he did this to Christ was to use words—words which twisted what God had already revealed in order to put man before God.
In each tempting from the Devil, the Lord Jesus replied with words of His own—they came directly from Yahweh's Law.
To the temptation to use His power as God's Son to make bread from stones (Matthew 4:3), to satisfy an earthly need (as he had fasted for 40 days and was hungry), He replied with the truth of what is most important, living as the Son of Man:
4But he answered, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds out of the mouth of God.’” Matthew 4:4
3He humbled you, and allowed you to be hungry, and fed you with manna, which you didn’t know, neither did your fathers know; that he might teach you that man does not live by bread only, but man lives by every word that proceeds out of Yahweh’s mouth. Deuteronomy 8:3
To the temptation to use His power as God's Son to call forth angels to protect Him (Matthew 4:5-6), He replied with the truth of acting wisely as the Son of Man, and not attempting to use God as an amulet or magical protector:
7Jesus said to him, “Again, it is written, ‘You shall not test the Lord, your God.’” Matthew 4:7
16You shall not tempt Yahweh your God, as you tempted him in Massah. Deuteronomy 6:16
Finally, to the temptation to worship the Devil in exchange for the world's kingdoms and their glory (Matthew 4:8-9), He replied with the primary commandment of loving and serving Yahweh alone:
10Then Jesus said to him, “Get behind me, Satan! For it is written, ‘You shall worship the Lord your God, and you shall serve him only.’” Matthew 4:10
13You shall fear Yahweh your God; and you shall serve him, and shall swear by his name. Deuteronomy 6:13
The Son of God, as Son of Man upon the earth, gave us the perfect example to follow in the use of the shield of faith. It is raised up over us, formed from the words of Yahweh that He has revealed to us in His Word. It nullifies the accusations and methods of wandering of the Evil One, by affirming the truth, or what is real. It keeps us fixed, as the stars in the heavens, exactly where God has placed us. In this, we are able to stand, having withstood the attacks of the Enemy.
Thus we see that this shield of faith helps us to extinquish the fiery darts of the Devil's methods; it resists the ways that Satan attempts to travel with us with his false accusations and prosecutions.
Having been fully armed except for our offensive weapon, we receive our shield over all things, to keep the Enemy at bay.