When our “hearts” (which is our English way of describing an ancient concept of the “deepest seat of our deepest emotions”) belong to Christ, there is such wonderful, beautiful change.
Paul describes it in Colossians 3:12-17.
When Christ rules the deepest seat of my deepest emotions, anger is shoved away and love takes its place. Bitterness is crushed and compassion flows in its place. No more resentment. Out flows mercy and kindness.
Let my life be filled with his glory and lived for his glory.