And let the peace that comes from Christ rule your hearts. For as members of one body you are called to live in peace. And always be thankful. [Colossians 3:15 (NLT)]
The only way to let peace truly rule our hearts is to surrender to God and allow him to rule our lives. It is His presence in our lives that will give us peace in the midst of turmoil, sorrow, or stress.
Oh Lord, let your Holy Spirit rule my life so that your heavenly peace rules my heart. Only then will I, indeed, be thankful in all circumstances.