The Apostle Paul wrote this while he was in a Roman prison:
“Rejoice
in the Lord always; again I will say, rejoice. Let your reasonableness be
known to everyone. The Lord is at hand; do not be anxious about anything,
but in everything by prayer and supplication with thanksgiving let your
requests be made known to God. And the peace of God, which surpasses all
understanding, will guard your hearts and your minds in Christ Jesus.” (Philippians
4:4-7 ESV) [1]