Read this exquisite passage. It describes what happened when Samuel, one of the great Old Testament prophets, called by God as a child, grows to be the prophet who God sends to find a King for Israel. Saul is the son of Cis, who with his servants, were seeking asses of Cis that had strayed. After an unsuccessful search, Saul then seeks a seer help him to find the asses, and is directed by maids drawing water to the city where Samuel may be found. Samuel, walking, sees Saul and then hears the Lord's voice telling him that Saul is the one he seeks who will be the King of Israel. Samuel takes Saul to where he was staying and prepares a dinner for him and thirty guests. He then tells Saul that God has chosen him to be King of Israel and anoints him with the consecrated oil and instructs him where to go and which people to meet. This is what happened to Saul then:
1 Kings 10:9-13
So when he had turned his back to go from Samuel, God gave unto him another heart, and all these things came to pass that day. And they came to the foresaid hill, and behold a company of prophets met him. And the spirit of the Lord came upon him, and he prophesied in the midst of them. And all that had known him yesterday and the day before, seeing that he was with the prophets, and prophesied, said to each other: What is this that hath happened to the son of Cis? Is Saul also among the prophets? And one answered another, saying: And who is their father? Therefore it became a proverb: Is Saul also among the prophets? And when he had made an end of prophesying, he came to the high place.
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Is this not so beautiful? "God gave unto him another heart." In the same day that Saul was seeking lost animals that belonged to his father, he is found by Samuel, anointed King of Israel, and "God gave unto him another heart." I think that some who have been converted, or reverted, to their faith, even if the process is very gradual, can still relate to the sweeping personal grandeur of feeling God giving one another heart. And then the spirit of the Lord came upon him and he prophesied. This causes amazement among those who knew him and even a proverb arises from this, "Is Saul also among the prophets?" When God sends the Holy Spirit, there is a sweeping transformation that is so beautifully described here, as Saul goes from seeker of his father's lost asses to prophet and King.