God could have saved us and made us instantly perfect. Instead, he chose to save us and leave indwelling sin in our hearts and bodies to wage war against the new and blossoming desires to please God that accompany salvation. This is a raging battle that we often lose, and that often leaves us feeling defeated and joyless in our walk with God. Yet [John] Newton also points out that since we know God does all things for his own glory and the good of his people, his decision to leave Christians with many struggles with sin must also somehow serve to glorify him and benefit his people. This is shocking news, isn’t it?
– Duguid, Barbara; Extravagant Grace: God’s Glory Displayed in our Weakness; P&R Publishing; Philippsburg, NJ; copyright 2013; Page 294