Have you ever been wronged, and you began to lose sleep over it? Maybe someone stole from you. Or maybe someone said something against your character. Our selfish humanity will rise up in us and we'll feel the need to right the wrong or to defend ourselves. Pastor David wants to remind us that vengeance belongs to the Lord. He will defend us better than anything that we can come up with on our own anyways! We may not see it in this lifetime, but we need to just step aside, let go, and let God.