Our God has an Adversary. And when we choose to walk in a relationship with God, Satan aims his attacks at us as well. Jesus’ work on the cross ensures Satan’s defeat, but for now the Adversary is still active in the world and fighting against God’s people.
Knowing that He has called us into a battle, God makes sure that we’re well equipped to stand against spiritual wickedness. He offers us His own strength and clothes us with appropriate armor. The first three pieces of this armor are the Girdle of Truth, the Breastplate of Righteousness, and the Footwear of the Gospel. They’re all vital, but there’s something particularly important about this fourth piece.
in everything taking up the shield of faith, with which you are able to quench all the flaming arrows of the evil one (Eph. 6:16, LEB)
The King James says, “Above all, taking up the shield of faith.” Whichever translation you use, the emphasis is clear. The shield of faith is needed all the time in everything we do and we must make using it a high priority.

The One Who Shields Us
This is the only reference to shields in the New Testament. They’re mentioned quite often in the Old, though. Many of these references speak of war and soldiers, for shield and spear were standard weapons (1 Chr. 12:8; 2 Chr. 14:8; 25:5). But there are also many versus like this one:
God is my rock in whom I take refuge; my shield, and the horn of my salvation, my high tower, and my refuge. My savior, you save me from violence. I call on Yahweh, who is worthy to be praised; so shall I be saved from my enemies. (2 Sam. 22:3-4, WEB)
Comparing God to a shield shows up several times in David’s writings (Ps. 3:3, among others). God also describes Himself as Abraham’s shield (Gen. 15:1) and all Israel is told Yahweh is “the shield of your help” (Deu. 33:29, WEB). It is a symbol of protection held by a capable defender. Read more