Acts 13:22

“Having deposed him,” i. e., King Saul. Why did God depose Saul and cast him away? Because he spared Agag, the king of the Amalekites. Why was this? Because the Amalekites fought against Israel and did their utmost to keep them out of the promised land. See this grand symbolic truth. You must destroy everything that keeps you from sanctification. Agag typifies inbred sin, which must be utterly destroyed. Saul spared Agag and lost the kingdom and his soul, dying a suicide; so if you do not destroy inbred sin in entire sanctification, you will forfeit the kingdom of God, commit spiritual suicide and lose your soul. Why was David a man after God's own heart? He was not infallible. He fell in case of Uriah, but God wonderfully restored him. “I have found David, the son of Jesse, a man after my own heart, who will do all of my wishes.” Would you be a man after God's own heart? Then you must do the whole will of God. King David was an exception to all the kings of the earth, in the fact that he did not his own will, but the will of God. David's throne was unearthly, focalizing in heaven. He was simply the executive of the divine administration, sitting on the throne of the theocracy, ruling as God's vicegerent. Hence the risen Jesus was crowned David's Successor (as He is his heir) in heaven when He ascended (Acts 2:30), and will be crowned David's Successor on earth when He comes again (Acts 2:35).