2 Samuel 13 - God forgives sin, but the repercussions of our failures will still happen. Whatever a man sows, he reaps. David sinned, was forgiven, but too many people take advantage when a leader falls. The sordid thinking is, "...well if a 'great person' can sin, why can't it?!" David had to accept that immoral behavior was expressed in his own home amongst his own children! And then came murder. Absalom killed his own brother. David didn't suffer death over his sin, but he certainly suffered watching his own children kill and be killed over their sins.
2 Samuel 14 - Absalom ran away and David ached in his heart because of the events in his own home. Joab knew David really wanted Absalom to come home and he arranged for a woman to convince David to invite him to return. This whole scene is setting up what is about to happen in the next several chapters.
2 Samuel 15 - Absalom came home but then he revolted against his own father. This caused David to flee from his home and go back to wandering in the wilderness. This, too, was a direct result of his own failures. But, as God had protected David in the past so He was with David again. I'm glad that David didn't want the Ark of the Covenant to be with him. He put His trust in God, not in a gold box.