Philippians 4:8 tells us to think on these things: "...whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things." The first thing we must begin to do is meditate on the Word of God. When we do this we will quickly find out that the Word of God is contrary to the way most of us have been taught and are accustomed to thinking. We must then choose for the Word of God to abide in us and overcome our old ways of thinking and worldly thoughts. 2 Corinthians 10:4-6 calls these old thought patterns "strongholds." We must overthrow them with the Word of God!
The Word says, "Fight the good fight of faith," (1Timothy 6:12). Our faith is aggressive; it's not passive, and it uses the Word of God as its weapon. That is how we overthrow these "strongholds." It also says, "Let not your heart be troubled and do not be afraid." (John 14:27). Think about this: God is not worried He will run out of money or resources. God is not filled with anxieties about our problems. He has ALL the supply and has more than enough power to get us through every circumstance in VICTORY.
We must fill our hearts with the Word of God, fill our thoughts with the Word of God, and fill our mouths with the Word of God. If we are going to think something, or if we are going to say something, let it be His thoughts, His Words, and fill our lives with the peace of God Himself. Let His Words abide in us, let His peace abide in us, and close the door to all other kinds of thoughts, words and actions.
Be very selective about what you think, say and do. Overthrow every "stronghold" the devil tries to put on you. When he comes around with a thought of anxiety or disaster, just say, "those are not my thoughts," and immediately tell him directly from the Word of God what your thoughts are. We must begin to choose thinking things that are just, pure, lovely, of good report, of virtue, and praise. Confess "I think only on things that are true, honest, just, pure, lovely and of good report. I think on virtuous and praiseworthy things. I will think on these things!"