We cannot hang on to our sin and expect God to give us victory. We must be wholly surrendered to God. Finally, we must understand the consequences of sin. Sin results in spiritual death, emotional death, and even physical death. Sin is a horrible thing.
Sin kills our spirits.
It destroys our families. It will even take our lives. Such is what happened to Achan. He thought he could get away with a small sin. But it resulted in the death of a number of Hebrews as they attempted to capture Ai.