John Mark
Mark 9:32ESV·traditional attribution

But they did not understand the saying, and were afraid to ask him.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Christ foretels his own approaching sufferings. He passed through Galilee with more expedition than usual, and would not that any man should know of it (Mar 9:30); because he had done many mighty and good works among them in vain, they shall not be invited to see them and have the benefit of them, as they have been.

Commenting on Mark 9:30-40

John Gill Reformed Baptist @doctorgill

But they understood not that saying,.... Meaning either the whole of what he had said, concerning his delivery, death, and resurrection: and which then must be interpreted with some limitation; for they must understand the sense of his words, which were clear and express; especially concerning his death, which affected their minds with trouble and grief; for Matthew says, "they were exceeding sorry upon it"...

Adam Clarke Methodist @methodicalclarke

But they understood not - This whole verse is wanting in two MSS., in the first edition of Erasmus, and in that of Aldus. Mill approves of the omission. It does not appear likely, from Matthew's account, that three of the disciples, Peter, James, and John, could be ignorant of the reasons of Christ's death and resurrection, after the transfiguration; on the contrary, from the...