Demons are subject to believers ( words of Jesus )

 Jesus told the disciples to rejoice in there names being written in the book of life, ( being delivered from that day of trouble Dan 12:1, and  guaranteed entrance in the new Heaven Rev 21:27  ) and not rejoice in overpowering the enemy, because they are subject to us ( believers ), and we should be exercising our authority; ( Lk 10: 20 ) God bless!