Catena Aurea on Matthew 12:31–32: Augustine of Hippo

For what difference does it make to the purpose, whether it be said, “The spirit of blasphemy shall not be forgiven,” or, “Whoso shall blaspheme against the Holy Spirit it shall not be forgiven him,” as Luke speaks [Luke 12:10]; except that the same sense is expressed more clearly in the one place than in the other, the one Evangelist not overthrowing but explaining the other? “The spirit of blasphemy” it is said shortly, not expressing what spirit; to make which clear it is added, “And whoso shall speak a word against the Son of man, it shall be forgiven him.” After having said the same of all manner of blasphemy, He would in a more particular way speak of that blasphemy which is against the Son of Man, and which in the Gospel according to John He shews to be very heavy, where He says concerning the Holy Ghost, “He shall convince the world of sin, of righteousness, and of judgment; of sin, because they believe not on me.” That then which here follows, “He who shall speak a word against the Holy Ghost, it shall not be forgiven him, neither in this world, nor in that which is to come,” is not said because the Holy Spirit is in the Trinity greater than the Son, which no heretic ever affirmed.