In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one.
(Ephesians 6:16)

I like thinking of fighting off the devil with my mighty shield held high, deflecting those flaming arrows.  It's a visual reference that comes to mind when I'm being confronted with temptations and other obstacles put before me in my daily battles.  I may not be holding a real, material shield, but the shield that I am holding is much more powerful and stronger than any real shield could ever aspire to be!