Manasseh did not drive out all of its land’s inhabitants. Neither did Ephraim, nor Zebulun. Asher, Naphtali, and Dan left foreigners in their lands as well. With these incomplete conquests, the Angel of the Lord (thought to be a pre-incarnate appearance of Jesus) came up from Gilgal to Bochim and reminded the Israelites of the consequences of not driving out the inhabitants of the land, “…they will be thorns in your side, and their gods will be a snare to you.” The people lifted up their voices and wept, and they called the name of the place Bochim (which means weeping) and sacrificed there to God. Then Joshua dismissed the people to possess the land.
Don’t leave work undone. When God calls you to a task, complete it. God will enable and strengthen you to finish the task if He calls you to it. Also, it is important to resist and remove all tempations and weaknesses from one’s life in order to have complete victory. While it is impossible to never be tempted to sin, it is the responsibility of the Christian to remove obvious sources of temptation from one’s life. Don’t play with fire. If you play with fire, you will get burned. Leave the fire of sin alone!