When we allow the negative thoughts to constantly play in our mind, we have given satan permission to take control.
Think about what your thinking. Now think about those things that are true, honest and pure.
Take control of your thoughts, resist satan, and he must leave you.
II Corinthians 10:5 (KJV) – casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and brining into captivity every thought to the obedience of Christ.
Philippians 4:8 (KJV) – 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.
James 4:7 (KJV) – submit yourselves therefore to God. Resist the devil, and he will flee from you.