These are excellent verses to meditate on for the pulling down of strongholds! Print them out and go over them every day for a week and see if it doesn't make a big impact on your spiritual growth and freedom! Meditate on God's Word as King David did! These verses are truth, and will help you tear down strongholds (which are based on lies and deception).

Philippians 4:8, "Finally, brethren, 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."