Romans 5:1 (KJV) says:

Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:

Justified means to be declared right.  So, we are declared right by faith in our Lord Jesus Christ, and we have peace with God.  Before accepting Jesus, we were enemies of the cross, but upon receiving Jesus, we are at peace with God.  Our relationship with God is now a relationship of peace. 

In Philippians 4:9 (KJV) the Apostle Paul calls the Lord the God of peace.

Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.

We are now in relationship with the God of peace, meaning that our peace comes from Him.  He is the source of peace and He is our Peace.  Jesus is even called the Prince of Peace.

Furthermore, Philippians 4:6-7(AMP) states:

Do not be anxious or worried about anything, but in everything [every circumstance and situation] by prayer and petition with thanksgiving, continue to make your [specific] requests known to God. And the peace of God [that peace which reassures the heart, that peace] which transcends all understanding, [that peace which] stands guard over your hearts and your minds in Christ Jesus [is yours].

What I want to point out is that we must be at PEACE WITH GOD (born again) and therefore have the GOD OF PEACE in us in order to experience and lay hold of the PEACE OF GOD.  Peace is a right and privilege of the child of God that stems out of a personal relationship with our Heavenly Father.  When we are right with God, we know the God of peace is in us and with us.  This produces the peace of God, which allows us to go through life unfazed by the trials we face.  We are at peace with God, we have the God of peace with us, so we can rest in the peace of God. 

If you have never been born again and are not at peace with God, that can be fixed easily.  Go to the "Most Important Thing" page of our website and pray a prayer that will make you God's very own child and change your life forever!