God could change you in an instant so you would never sin again. So why doesn’t he make us completely holy now? https://www.desiringgod.org/messages/the-glory-of-god-in-the-sight-of-eternity/excerpts/why-god-sanctifies-us-slowly https://www.desiringgod.org/messages/the-glory-of-god-in-the-sight-of-eternity