Amazement in the Gospel does not always lead to faith. People are astounded to see Jesus liberate a dumb man from the evil power that prevented him from speaking. But, rather than seeing here the clear intervention of God's saving power, they see in Jesus the power of another evil spirit. More than that, they ask Jesus to give some special sign of His authority and identity, as if the act itself was not a convincing sign. Jesus shows the contradiction of their position. Why would the devil drive himself out of a possessed person? But, when people do not want to believe, they will fall back on any reason, however contradictory. The only reasonable conclusion is that God's power is with Jesus. And, if it is by God's power that Jesus liberates people from evil powers, then it is obvious that God's Kingdom, God's reign has come among them. So many times we write off people and events and so fail to realise that God is saying something important to us through them. They may be saints or sinners - it does not matter. God can and does use any channel to reach us.