Mark 9:19

The unbelieving generation included the father and the crowd. The nine disciples could not exorcize the demon because of their weak faith (cf. Mark 9:29). Jesus’ first rhetorical question expressed frustration that His presence with them had not resulted in greater faith (cf. Mark 4:40; Mark 6:50; Mark 6:52; Mark 8:17-21). His second question reveals the heavy load that their unbelief placed on Him (cf. Mark 3:5; Mark 8:12).