David returns the Ark to Jerusalem and "dances before the LORD;" God then establishes the Davidic Covenant, promising to David an eternal throne, dynasty and kingdom.
The civil war between the House of David and the House of Saul ends with murder, assassination and bloodshed, but David begins to unify the 12 tribes with grace, compassion and justice.
Saul hits his spiritual bottom by going to a medium for counsel and David hits his spiritual bottom by his plans to join the Philistines in a war against his own people.