Hymn 306

I belong to Jesus

He is Lord and King

Reigning in my inmost heart

Over everything

- Hymn 306

https://www.hymnal.net/en/hymn/h/306

Colossians 3:15 And let the peace of Christ arbitrate in your hearts, 

to let the peace of Christ arbitrate in our hearts, is to enthrone this peace, who is Christ Himself within our heart, to allow Christ to rule and reign within us as the Lord and King, and to let Him be the decider for everything.