Once again, we see that man doesn't drive out demons in Mark 9:29 and the preceding verses. God can drive out demons, and prayer can. Man does nothing without allowance from Providence.
The warnings of Mark 9:38-50 are incomprehensible and make little sense in my mind.
On it being more blessed to give than to receive, we do not see this verse in the Gospels, but only in this one verse from the writings of Luke.