It's important to realize that the devil and his demon helpers are real. One type of a demon is a spirit of divination; this type of spirit will possess a person and give them information about others.
There are demons that follow people and know all kinds of intimate details about them. They will speak to this spirit of divination, who in turn speaks to the mind of the one whom they are possessing. The psychic may not know that demons are involved, nor may ever admit it, but according to the Bible, this is what is taking place.
Let's take a look at a specific account from the Bible:
Now it happened, as we went to prayer, that a certain slave girl possessed with a spirit of divination met us, who brought her masters much profit by fortune-telling.The practice of psychic phenomena is as old as mankind and the Bible very clearly tells us not to have any part in this type of activity (Deut. 18:9-14).
This girl followed Paul and us, and cried out, saying, "These men are the servants of the Most High God, who proclaim to us the way of salvation." And this she did for many days. But Paul, greatly annoyed, turned and said to the spirit, "I command you in the name of Jesus Christ to come out of her." And he came out that very hour.
But when her masters saw that their hope of profit was gone, they seized Paul and Silas and dragged them into the marketplace to the authorities.
(Acts 16:16-19)
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