To be the sons of God, we do the works of the Father in heaven. If we instead do the works of the devil—which are sin—then he is our father instead. And if we do the works of the Father, then we become equal to the angels, the original “sons of God” who do His works.
Having been given this outpost of Paradise, this place where God’s holiness may be encountered with preparation, where the cherubim with the flaming sword welcome us in instead of turning us away, we are commanded to expand this Paradise into the world.
The targeted demonic attacks we experience especially in this holy season are real, and we can spot them because of how they are so specifically designed to pull us away from participating in it. But these things do indeed come out by prayer and fasting.
With the calling of these disciples, Christ is building His army. Later in the Gospels, we will see Jesus’ disciples doing what He does in the very next passage after this one—casting out demons, calling people to repentance. And this is not only His army but also His government.