Philippians 4:6-7

Be anxious for nothing, but in everything by prayer and supplication, with thanksgiving, let your requests by made know to God; and the peace of God, which surpasses understanding, will guard your hearts and minds through Christ Jesus.  

We can’t fight a good battle in fear, and our prayers stop the fear.  Peace and trusting God is the best weapon in our arsenal.  When we move away from viewing our problems in the natural and turn them over to God, the supernatural begins to work on our behalf.  Prayer is a force to work on our behalf.