John Chrysostom — as excerpted in the Catena Aurea on John 18:19-21

“(Hom. lxxxiii) Or, He spoke in secret, but not, as these thought, from fear, or to excite sedition; but only when what He said was above the understanding of the many. To establish the matter, however, upon superabundant evidence, He adds, Why askest thou Me? ask them which heard Me what I said unto them; behold, they know what I said unto them: as if He said, Thou askest Me of My disciples; ask My enemies, who lie in wait for Me. These are the words of one who was confident of the truth of what He said: for it is incontrovertible evidence, when enemies are called in as witnesses.”