Your shield–a protective verse that you can reflect on and draw strength from even when you aren’t in the direct heat of battle–may be even more important than your sword, because it places temptation out of earshot.
Try selecting this verse as your shield:
Flee from sexual immorality… You are not your own: you were bought at a price. Therefore honor God with your body. (I CORINTHIANS 6:18-20)
You can distill this shield-verse to its core kernel, and repeat it in the face of many tempting situations when facing sensual images or thoughts. You have no right to look at that or think about that. You haven’t the authority. A shield such as this will help you think rightly about the real issues involved as you face temptation in your fight for purity. Satan’s power of temptation lies in your supposed right to make decisions regarding your impure sexual behavior. If you didn’t believe you had that right, no tempting power could touch you.