The Apostle Paul
Colossians 3:15ESV·traditional attribution

And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful.

John Calvin Reformed @genevareformer

15. And the peace of God. He gives the name of the peace of God to that which God has established among us, as will appear from what follows. He would have it reign in our hearts. “Rule in your hearts, (βραβεύετο.) Let the peace of Christ judge, decide, and govern in your hearts, as the brabeus, or judge, does in the Olympic contests...

Matthew Henry Presbyterian @wholebiblehenry

The apostle proceeds to exhort to mutual love and compassion: Put on therefore bowels of mercy, Col 3:12. We must not only put off anger and wrath (as Col 3:8), but we must put on compassion and kindness; not only cease to do evil, but learn to do well; not only not do hurt to any, but do what good we can to all. I.

Commenting on Colossians 3:12-17

John Gill Reformed Baptist @doctorgill

And let the peace of God rule in your hearts,.... By "the peace of God" is meant, either the peace believers have with God, which is his gift, and passes all understanding, and flows from a comfortable apprehension of interest in the blood, righteousness, and atonement of Christ; or rather that peace which does, or should subsist among the saints themselves, which God is the...