We have all had those emotional experiences where we realize God will take care of us. Suddenly, we feel His peace and security, and all is well with the world.
But, how do you keep that feeling.

Right after Paul tells you how to receive God's peace, he tells you how to keep it.

... Fix your thoughts on what is true, and honorable,
and right, and pure, and lovely, and admirable.
Think about things that are excellent and worthy of praise.
- Philippians 4:8 (NLT)

Where do your thoughts dwell throughout the day? Do you meditate on the negative news you saw this morning, or all of the things on your ‘to do’ list. Or are your thoughts dominated by the promises of God?

Controlling your thoughts is one of the most difficult things to do. But, Paul says that it is a must if you are planning to walk in peace.

Joyce Meyer has actually written an excellent book that can guide you in learning how to take any thought captive that goes against God's promises (2 Corinthians 10:5). It is called Battlefield of the Mind.

For years I, personally, struggled with controlling my thoughts. Some of the truths that I learned through that book really changed my life. Because of the difference that made in my life, I truly recommend reading Battlefield of the Mind over and over again until the wisdom it holds really gets into your heart.

If you are ever going to walk in the peace of God, you have to learn not to let negative fearful thoughts just run around your brain unhindered.
http://www.hem-of-his-garment-bible-study.org/Christian-stress-management.html