"Let the saints be joyful in glory: let them sing aloud upon their beds. Let the high praises of God be in their mouth, and a two-edged sword in their hand;" - Psalms 149:5-6
In David's Psalm 149, he gives us a picture of the position that the saints of God should take -- with songs of praise and worship in their throats and the two-edged sword in their hands. In the remainder of the psalm, he goes on to infer that this position is taken by the saints in order to defeat their enemies.
Praise defeats the devil quicker than any other battle plan. Praise is a garment that we put on and that will protect us from defeat and negativity in our minds. But it must be genuine heart praise, not just lip service or a method being tried to see if it works. Also, praise involves the Word of God found in the scriptures.
Worship is a battle position! As we worship Heavenly Father and strive to know Him, and to exemplify His attributes, and humbly recognize his abilities and might, we will see His great power and attributes released on our behalf.
I am sure your heart frequently fills up with love and worship for Heavenly Father. Always remember to be greatful. When we humbly seek the Lord in prayer and supplication our enemies have no power over us. The chains of iniquity are shed and we are released from the grasp of the advesary.
God never loses a battle. He has a definite battle plan, and when we follow it, we always win.