V.14-21 Privileged as these three had been to see the Lord’s glory, this did not help them to be able to cure the poor moonstruck — that is what “lunatic” means — man. Prayer and sincerity attach us to God as nothing else will do.
V.22-23 The second time He explains carefully what would be done to Him. We will hear it twice more. So, four times He tells it, and they couldn’t even understand it, let alone believe it (See Luke 18:3434And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken. (Luke 18:34)).
V.24-27 The Jews come to collect a tax for the temple. They try to catch Him. Christ was Son of the God of the temple, and includes Peter with Himself in that place of privilege. As such they didn’t need to pay the tax. But He takes the place of being a stranger and pays! He shows Who He really is by this miracle.