Jamieson, Fausset and Brown on Mark 9:33

33. What was it that ye disputed among yourselves by the way?--From this we gather that after the painful communication He had made to them, the Redeemer had allowed them to travel so much of the way by themselves; partly, no doubt, that He might have privacy for Himself to dwell on what lay before Him, and partly that they might be induced to weigh together and prepare themselves for the terrible events which He had announced to them. But if so, how different was their occupation!