Which disciples had been unable to heal the child? Were they ones who had not been to the mountaintop to witness the transfiguration and see the cloud and hear the voice? Or, even after all those experiences, were Peter and John and James unable to cast out spirits? Who is Jesus calling faithless and perverse? Does he mean the crowd or does he mean the disciples who were not able to perform the miracle?
If the crowd didn't know who Jesus was, or all of the disciples, how did the father know that Jesus could heal his son? How did the demon know that Jesus was the one it had to obey?
In verse 36, we are told that they kept silent and told no one what they had seen on the mountain. But, in verse 43, everybody who saw what happened recognized the power of God acting in this man Jesus. If everybody knew it, why did Peter and John and James have to maintain silence?
Then, in verse 45, we are told the meaning was hidden from them so they wouldn't be able to grasp it. What other meanings seem to be hidden from us yet?