When the 72 disciples returned, they were overjoyed, telling Jesus that the demons had submitted to them based on his name (the authority that his name represented). He knew that, through his death, the powers of darkness would be defeated.

Luke 10:17-20 Easy English Bible > Later, the 72 disciples that Jesus had sent out returned to him. They were very happy. ‘Master,’ they said, ‘even bad spirits obey us. When we use your name, they do what we say.’ Jesus replied, ‘I saw the Devil himself fall from heaven like lightning. Listen! I have given power to you. You will even stand on dangerous snakes and insects and you will have authority over all the power of the Devil. Nothing will hurt you. But do not be happy because you have authority over bad spirits. God has written your names in his book in heaven. That is why you should be happy.’