the Precept (Principle)
1 Thessalonians 5:13e
Be at peace among yourselves.
the Promise (from God)
Matthew 5:9
Blessed are the peacemakers: for they shall be called the children of God.
our Prayer (to God)
Psalm 68:30e
Scatter thou the people that delight in war.
Take each Precept and Promise and Prayer and pray them back to the Lord as one prayer
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NOTE: Have you considered that having a “prepared heart” includes being at peace with everyone? Everyone? And in case you missed it, “everyone.” It may mean you quit hanging out with certain people.