Augustine of Hippo
To begin with, I will address your request for clarification from the first book of Kings, specifically regarding the passage that states, “And the Spirit of the Lord entered into Saul” (1 Sam. 10:10), which contrasts with the assertion found elsewhere that “And the evil spirit of the Lord was in Saul” (1 Sam. 16:14). The text recounts, “And behold, when he turned to go from Samuel, God changed Saul’s heart, and all the signs were fulfilled that day. He then proceeded to the hill, where a group of prophets encountered him, and the Spirit of God came upon him, and he prophesied among them.” This was foretold to Saul by Samuel during his anointing as per God’s command. In my understanding, this situation raises no challenges.
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As it is said, “the Spirit breathes wherever He wills” (John 3:8), the prophetic Spirit remains unblemished despite being with any soul, for He pervades all things in His purity (Prem. 7:24).
However, He does not manifest in identical ways for everyone; some He enlightens by revealing visions, others He influences through understanding and intellect, still others He inspires directly, and some even amid their ignorance. The prophetic Spirit conveys messages in two primary ways: one involves dreams, which many saints experienced, as well as Pharaoh and King Nebuchadnezzar, both of whom saw visions they could not comprehend (Gen. 41; Dan. 2; Dan. 4). The second mode occurs in a state of fervor, referred to by some Latin writers as stupor—though in a more symbolic sense, indicating a detachment from bodily senses. In such instances, the spirit of a person, enveloped by the Divine Spirit, is liberated from tangible images and contemplations. This is evident in Daniel’s experiences and in Peter's vision of a vessel descending from heaven (Acts 10:11), which he too did not initially understand.
When the mind is guided by the Spirit to comprehend images meaningfully, this constitutes prophecy in its truest form; as the apostle defines it (1 Cor. 13:2). For instance, Joseph grasped what Pharaoh merely witnessed, while Daniel elucidated matters to the king that he had seen without full understanding. Yet, when the Spirit's influence allows one to perceive things directly—apprehending Divine truth, justice, and wisdom—this diverges from the conventional notion of prophecy we are discussing. The two types of prophetic inspiration can occur; some receive images and immediately grasp their significance, or they understand through visions accompanied by explicit communication, which sheds light on what is revealed in Scripture.
There are also instances where the prophetic Spirit reaches individuals who lack awareness, as exemplified by Caiaphas, who, despite his ulterior motives, prophesied about the necessity of one man dying for the people (John 11:49-50); he was unaware that his words were not his own. Numerous accounts illuminate this truth, and I speak of matters well within your interest. Your inquiries reflect not only a desire for knowledge regarding my understanding but also a willingness to correct any misconceptions. The statement in Scripture, “The Spirit entered into him” (1 Sam. 10:10), indicates a sudden influence from the hidden depths of Divinity. Therefore, concerning how Saul experienced these transformations, it is quite evident from the text: “God changed Saul’s heart to another,” signifying a renewed disposition that enabled him to recognize prophetic visions filled with meaning and foresight. Further exploration of this interpretation can be found regarding 1 Samuel 10:12.