As Paul had promised, he returned to Ephesus. Like Jesus, he preached about the kingdom of God and not about optimising life (Acts 19:8-22). Extraordinary miracles took place through Paul.
After the failed attempt by the seven sons of Skeva to drive out spirits with the name of Jesus, it became clear that Jesus would not allow himself to be instrumentalised. Complete submission to his rule (kingdom of God) is necessary. It is therefore important that Jesus is accepted as Lord.
In magic, people try to utilise spiritual powers for personal advantage. In doing so, they become dependent on people and spirits.
Hidden sins are revealed in the presence of God. This is the reason spiritual books were publicly burnt in Ephesus.
The kingdom of God cannot be instrumentalised for our purposes. We must recognise Jesus as Lord and King.