Our minds are filled with all kinds of things, good and bad, which controls our peace.

The word of God tells you what to think on, to give you peace.

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.