The Holy Spirit illuminates the believer to see spiritual truth. In this role, He is the teacher of spiritual truth. "The god of this age has blinded, [those] who do not believe" (2 Cor. 4:4). This means the unsaved person cannot understand spiritual truth. But when a person is converted, the Holy Spirit becomes the Helper to teach or illuminate so the person can understand spiritual truth. The job of teaching or illuminating the believer has several names in the New Testament. At one place it is called "the anointing." "But the anointing which you have received from Him abides in you, and you do not need that anyone teach you" (1 John 2:27). This does not mean the believer should not have human teachers, but that the Holy Spirit is the Teacher who causes the believer to understand, whether or not a human teacher is involved in the learning process. The apostle Paul noted, "The natural man does not receive the things of the Spirit of God ... because they are spiritually discerned" (1 Cor. 2:14). In contrast, "We have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God" (1 Cor. 2:12). Returning to the illustration of the Helper/Teacher, John the apostle puts these two together: "But the Helper, the Holy spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you" (john 14:26)  https://news.gap-world.org/article/22