“I know who you are, the Holy One of God.”
These are the words of the demon living in the man with the unclean spirit. The demon might have known who Jesus was, but he didn’t believe in him. The demon gave authority in its life to the evil forces of the world. It is one thing to call Jesus “the Holy One of God”; it is another to live and act as one who believes he is “the Holy One of God.” Look at the story in Mark 8:27-38. Peter, like the demon, knew the right words to say, but he didn’t truly believe.