“Prayer for peace in my heart” is partially based on Ephesians 2:13-18 which speaks about how Jesus is our only true peace. He makes peace between you and God by ending all conflict and hostility. But beyond just an end to disagreement, true peace is a unified heart. Pray for peace in your heart and God will give it to you.
really spirolosiphically stressed about the distinction between destiny/fate/personal intervening God AND/OR a karmaic self-determining reality it is only ideology, but they are conflicting core spiritual ideas