John Chrysostom — as excerpted in the Catena Aurea on Matthew 12:31-32

“Otherwise according to the first exposition. The Jews were indeed ignorant of Christ, but of the Holy Ghost they had had a sufficient communication, for the Prophets spake by Him. What He here saith then is this; Be it that ye have stumbled at Me because of the flesh which is around Me; but can ye in the same manner say of the Holy Spirit, We know Him not? Wherefore this blasphemy cannot be forgiven you, and ye shall be punished both here and hereafter, for since to cast out dæmons and to heal diseases are of the Holy Spirit, you do not speak evil against Me only, but also against Him; and so your condemnation is inevitable both here and hereafter. For there are who are punished in this life only; as they who among the Corinthians were unworthy partakers of the mysteries; others who are punished only in the life to come, as the rich man in hell; but those here spoken of are to be punished both in this world, and in the world to come, as were the Jews, who suffered horrible things in the taking of Jerusalem, and shall there undergo most heavy punishment.”