Caiaphas did not say this on his own. Instead, as high priest that year, he was prophesying that Jesus would die for the nation,
51. Now he spoke this, not of himself. When the Evangelist says that Caiaphas did not speak this of himself, he does not mean that Caiaphas — like one who was mad, or out of his senses — uttered what he did not understand; for he spoke what was his own opinion.
We have here an account of the consequences of this glorious miracle, which were as usual; to some it was a savour of life unto life, to others of death unto death. I. Some were invited by it, and induced to believe.
Commenting on John 11:45-57
And this spake he not of himself,.... Not of his own devising and dictating, but by the Spirit of God; as a wicked man sometimes may, and as Balaam did; the Spirit of God dictated the words unto him, and put them into his mouth; nor did he use them in the sense, in which the Holy Ghost designed them: but being high priest that...