Proverbs 11:17 (NKJV) — 17 The merciful man does good for his own soul, But he who is cruel troubles his own flesh.
Doing ourselves a favor. When we have mercy on others, we strengthen our own souls. When we are cruel and refuse to show mercy, however, we bring trouble to our own bodies. It is good for us, spiritually and physically, to be merciful and kind. It is damaging, spiritually and physically, to be hard, unbending, and cruel.