Martin Luther taught in his Small Catechism concerning the Lord's Prayer that "we daily sin much and indeed deserve nothing but punishment," which means that even though we have been saved by the blood of Jesus Christ, we still struggle on this side of eternity with living with the sinful nature. Here's one humorous take on it based on a story I heard on the radio in April 2007 from Dr. David Jeremiah:
A man was always asking his pastor how he could have complete victory over sin, but was frustrated because his pastor always gave him what he considered long, drawn-out answers. Being a practical businessman, he wanted a quick answer with an accompanying set of action items in bullet-point format that he could follow to achieve the exact result desired. And if there was an iPhone app for it, that would be even better. After all, he stopped reading C.S. Lewis' Mere Christianity because it had too many pages, didn't have any graphs or charts, and the author talked in a funny accent.
One day he called his pastor at home and shared his frustrations. "Pastor, you know I want to have complete victory over sin, but every time I ask you about it, you give me all these long, drawn-out answers. Now I'm going to ask you one more time, and I want a short answer—none of this intellectual stuff or the big words. What can I do now to have complete victory over sin so that I never fall into it again?"
The pastor paused to think for a moment, then gave his parishoner the short answer he demanded.
"Die," he answered. "Goodbye." And he hung up.
(If the punchline offends you, please re-read Luther's quote verrrry slowly.)