They said, “Isn’t this Jesus, the son of Joseph, whose father and mother we know? How then does he say, ‘I have come down out of heaven?’”
Christ let them question Him freely, no small condescension. The wise teacher listens swiftly and turns even foolish questions toward what profits. These Galileans asking "What shall we do?" show a teachable mind, unlike the Judean critics who came only to cavil. He answers the sincere request, not the impertinent quibble.
AI summary
Commenting on John 6:28-59
Jesus therefore answered and said unto them,.... Either overhearing what they said, or knowing, as God, their secret murmurs, and private cavils among themselves, thus addressed them, murmur not among yourselves: meaning neither about his descent from heaven, nor about coming to him, and believing in him; for it follows,