The closer you come to the Light{Truth} it will reveal the hidden things of the Dark.
When you enter a pitch black room you cannot see a thing, but when the light is turned on, all is seen. And the greater the light, the more the hidden things of darkness is revelaed.
Example:Mark 5:7 - And cried with a loud voice, and said, What have I to do with thee, Jesus, thou Son of the most high God? I adjure thee by God, that thou torment me not.
Jesus encountered many people possessed with demons, even to this day demonic possession exists. He encountered so many because He was the Light and his brightness exposed the darkness.
As believers grow in faith and truth the more they can see the darkness at work and rid the darkness with the source{Light}.
God Bless!