In order to be effective in the Gospel work, we must receive and rely on the power of the Spirit.

Paul moves onto Ephesus to do ministry there. He prays for some disciples who had not yet received the Spirit. By the power of the Spirit, Paul did extraordinary miracles. Some tried to replicate that power, but failed miserably. This resulted in deep respect for the Spirit and openness to the Gospel. (Ephesus later becomes the hub of the Gospel work.)