John 19:9

On this account he no more asks Him, "What hast thou done?" but, shaken by fear, he begins the enquiry again, saying, "Art thou the Christ?" But He answered not. For he who had heard, "To this end was I born, and for this came I," and, "My Kingdom is not of this world," he, when he ought to have opposed His enemies and delivered Him, did not so, but seconded the fury of the Jews. Then they being in every way silenced, make their cry issue in a political charge, saying, "He that maketh himself a king, speaketh against Caesar." Pilate ought therefore to have accurately enquired, whether He had aimed at sovereignty, and set His hand to expel Caesar from the kingdom. But he makes not an exact enquiry, and therefore Christ answered him nothing, because He knew that he asked all the questions idly. Besides, since His works bare witness to Him, He would not prevail by word, nor compose any defense, showing that He came voluntarily to this condition.

(Tr. cxvi. 4) In comparing the accounts of the different Evangelists together, we find that this silence was maintained more than once; viz. before the High Priest, before, Herod, and before Pilate. So that the prophecy of Him, As a sheep before her shearers is dumb, so opened He not His mouth, (Isa. 53:7.) was amply fulfilled. To many indeed of the questions put to Him, He did reply, but where He did not reply, this comparison of the sheep shows us that His was not a silence of guilt, but of innocence; not of self-condemnation, but of compassion, and willingness to suffer for the sins of others.

"When Pilate, therefore, heard that saying, he was the more afraid; and entered again into the judgment hall, and saith unto Jesus, Whence art thou? But Jesus gave him no answer." It is found, in comparing the narratives of all the evangelists, that this silence on the part of our Lord Jesus Christ took place more than once, both before the chief priests and before Herod, to whom, as Luke intimates, Pilate had sent Him for a hearing, and before Pilate himself; so that it was not in vain that the prophecy regarding Him had preceded, "As the lamb before its shearer was dumb, so He opened not His mouth," especially on those occasions when He answered not His questioners. For although He frequently replied to questions addressed to Him, yet because of those in regard to which He declined making any reply, the metaphor of the lamb is supplied, in order that in His silence He might be accounted not as guilty, but innocent. When, therefore, He was passing through the process of judgment, wherever He opened not His mouth it was in the character of a lamb that He did so; that is, not as one with an evil conscience who was convicted of his sins, but as one who in His meekness was sacrificed for the sins of others.