Peace

Rejoice in the Lord always. I will say it again: Rejoice! Let your gentleness be evident to all. The Lord is near. Do not be anxious about anything, but in everything, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.  

Finally, brothers, 

whatever is true, 

whatever is noble, 

whatever is right, 

whatever is pure, 

whatever is lovely, 

whatever is admirable

—if anything is excellent or praiseworthy

—think about such things.

Whatever you have learned or received or heard from me, or seen in me—put it into practice. And the God of peace will be with you. 

Philippians 4:4-9

Paul wrote this letter from jail to the Christ followers in Philippi. He was thanking them for their support of him. Paul hoped that he would be set free, but he also lived with the very real possibility that he may be put to death. It's a short little book, about half way through the New Testament of the Bible.