Then he went down to Capernaum, a town in Galilee, and on the Sabbath he taught the people. They were amazed at his teaching, because his words had authority. In the synagogue there was a man possessed by a demon, an evil spirit. He cried out at the top of his voice, “Go away! What do you want with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God!” “Be quiet!” Jesus said sternly. “Come out of him!” Then the demon threw the man down before them all and came out without injuring him. All the people were amazed and said to each other, “What words these are! With authority and power he gives orders to evil spirits and they come out!”  And the news about him spread throughout the surrounding area.

–Luke 4:31-37 (TNIV)

The demons knew who Jesus was and acted accordingly, because they had no hope in him. Do you know who Jesus is and do you act accordingly?