Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 21
And when he was come into the temple, the Chief Priests and the elders of the people came unto him as he was teaching, and said, By what authority doest thou these things? and who gave thee this authority? And Jesus answered and said unto them, I also will ask you one thing, which if ye tell me, I in like wise will tell you by what authority I do these things. The baptism of John, whence was it? from heaven, or of men? And they reasoned with themselves, saying, If we shall say, From heaven; he will say unto us, Why did ye not then believe him? But if we shall say, Of men; we fear the people; for all hold John as a prophet. And they answered Jesus, and said, We cannot tell. And he said unto them, Neither tell I you by what authority I do these things.
Not that they should answer it, and thereupon hear of Christ the answer to their question, but that being puzzled they should ask Him no farther; according to that precept He had given above, Give not that which is holy to the dogs. (Mat. 7:6.) For even if He had told them, it would have profited nothing, because the darkened will cannot perceive the things that are of the light. For him that enquires we ought to instruct, but him that tempts, to overthrow by a stroke of reasoning, but not to publish to him the power of the mystery. The Lord thus sets before them in His question a dilemma; and that they might not escape Him, says, Which if ye tell me, I in like wise will tell you by what authority I do these things. His question is this; The baptism of John whence was it? from heaven, or of men?