“But to all who did receive him, who believed in his name, he gave the right to become children of God.”
- John 1.12
He gave them the ἐξουσία – “power, authority, capability, might, ruling power, right to control,” these definitions from solid scholarly works, i.e, BDAG, LSG, Louw-Nida. What does this gift do? It gives eternal life to those under the judgment of death. What is the power of expelling a demon compared to the power of gaining eternal life? You have been given the greater. Receiving the greater, can you not do the lessor?