Eph. 4:23 tells us to be made new in the attitude of our minds; Col. 3:2 says, Set your mind on things above; Phil. 4:8 says Whatever is true, noble, right, pure, lovely, admirable, excellent, praiseworthy, think on these things. Eph. 5:18 says be filled with the Spirit. Gal. 5:16 says walk by the Spirit; Gal. 5:25 says live by the Spirit and keep in step with the Spirit. Romans 8:6 says the mind controlled by the Spirit is life and peace (NIV84)
To defeat fearful and anxious thoughts, our minds need to be reprogrammed so that we think rightly and walk by the Spirit. This comes by reading and meditating on God's Word and through praying to our heavenly Father about everything that concerns us. We need to listen to our thoughts and see if they are in alignment with God's Word. If not, we need to take our thoughts "captive to Christ" (2 Cor. 10:4-5). With our minds under the Holy Spirit's control we can be Spirit-filled and live productive godly lives. Prov. 23:7 says “As he thinketh in his heart, so is he.” (KJV)
I learned from Beth Moore's Believing God and Breaking Free Bible studies that if we’re caught in a stronghold of fear and anxiety, it’s because for too long we’ve fallen for Satan’s trap, seeing other things high and lifted up in our minds and thinking they are greater than God. Obstacles too hard for God to remove. We think fearful thoughts which produce fear and anxiety in us. Mental torment. But Luke 1:37 says nothing is impossible with God. Mark 10:27 says all things are possible with God. Mark 9:23 says all things are possible for one who believes. Faith-filled thoughts puts an end to fearful and anxious thoughts.
Romans 8:6 "The mind controlled by the Spirit is life and peace."
My NIV Life Application Bible (1984) discussed the above verse, and this is the shortened version: To set the mind on the Spirit means--A mind directed toward truth (the Scriptures), aware of the Spirit's presence (John 14:17), a mind seeking to please the Holy Spirit (Gal. 6:8), and a mind active in memorizing and meditating on the words of Christ (John 14:2).
Sounds like a great plan of action to join with Jesus to take back what the Enemy has stolen--peace of mind, heart, and soul.