1 Samuel 16 is pivotal in many ways, but perhaps the most profound is that David is a type of Christ for us. His heart and kingship is a symbol of greater fulfillment to come in Jesus. David clearly has the kind of heart that God is looking for; a heart that is devoted to knowing, loving, and obeying Him. (Acts 13:22) We are desperate for more of a heart like that, right?!
How can we know when our hearts are sick, or not in the right place? What can God do with sick hearts? Only he can make all things new.