The peace of God, which passeth all understanding, shall guard your hearts and your thoughts in Christ Jesus. Phil 4:7
This is a beautiful verse. The thought here being that God's peace acts as a guard against the enemy of our souls. It guards, in particular, our heart and mind. These two areas are where the enemy finds that we are most accessible.
Our heart, the seat of all our affections. If Satan can draw our affections, away from loving God and His Christ then he has succeeded in making us ineffective in our walk. The word says His peace will guard our hearts. When we are at peace then we are contented. We are not looking for other loves. We are happy and at rest in Christ our Saviour. This is where He wants us to be. He does not want us to be striving continually looking for satisfaction in other places, people or things, Our rest, our peace is in God.
Secondly, the peace of God guards our minds; the next most vulnerable area to the Christian. How often can one stray thought lead to a multitude of wrong thoughts which in turn cause us to lose our peace? Before we know it, we are in turmoil over something that can often be very small and insignificant. Learn to use God's peace like a guard. A protection around your mind. When you find something starting to niggle or worry you then turn deliberately back to that wonderful peace. Let it flood your mind and heart. The word says 'it passeth all understanding' which means we don't necessarily need to understand why we should be at peace, we simply trust and believe in it.
This is the way to be strong spiritually. This is the way to walk a consistent path with God; to become one of those Christians that you have always wanted to be when you cope with whatever is thrown at you in life and remain on an even keel no matter what. Practise this principle and you will find that you are practising the Presence of God.