Saul, Israel's first king, was disobedient and caused the Lord to cast him away. The dominating characteristic of David's life was obedience, he would do all God's will. Real success is usually best discovered in the private places of our hearts. Israel's greatest king, David, was a shepherd, a musician, a warrior, a leader, and a friend. Most important of all, he is described as a man after God's own heart.