The Shield of Faith
As Praying Christians, we must understand that our prayers affect the enemy in a negative way. When Jesus sent his seventy-two disciples into the cities, they returned rejoicing and said “Lord, even the demons submit to us in your name.” He replied, “I saw Satan fall like lightning from heaven. I have given you authority to trample on snakes and scorpions and to overcome all the power of the enemy; nothing will harm you" (Luke 10:17-19).
If we use the authority we have in Jesus, we must also learn how to use our shield of faith to defend ourselves. Swordsmen use their swords to attack the enemy and at the same time use their shield to defend themselves. The devil uses doubt to attack the mind. He would try to make us doubt ourselves, doubt God's word, and doubt God's power. He used the same tactic on Eve in the Garden of Eden (Genesis 3: 1-4).
With every attack of the enemy, we should use the Word of God to counter it. When Jesus was tempted in the Wilderness, he kept responding with "It is written.." (Matthew 4: 1-11)
Remind the devil who you are in Jesus Christ and what the Word of God says.
We must use the shield of faith to protect our minds and thoughts. "Above 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).
"Finally, brothers and sisters, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable - if anything is excellent or praiseworthy - think about such things" (Philippians 4:8).