The God of Peace wants us to have the Peace of God that surpasses understanding. We rejoice not because of our circumstances; we rejoice beause we have the Lord of all circumstances on our side.
Prayer gives the concern to God, thanking Him in advance with great expectation He hears and will answer us.
Lastly, we guard our hearts and minds by thinking on good things.
Where do you need peace today? Would you pray to the God of Peace now? Would you rejoice not because of your circumstances, but by faith you know the Lord is over all circumstances?