Matt. 12:3232 And whosoever shall speak a word against the Son of man, it shall be forgiven him: but he that shall speak against the Holy Ghost, it shall not be forgiven him neither in this world, nor in the world to come.
Haydock commentary:
— Nor in the world to come. From these words St. Augustine (De Civ. lib. xxi. chap. 13.) and St. Gregory (Dial. iv, chap. 39.) gather, that some sins may be remitted in the world to come; and consequently that there is a purgatory, or a middle place. (Challoner) — St. Augustine says these words would not be true, if some sins were not forgiven in the world to come; and St. Gregory says, we are to believe from these words in the existence of the fire of purgatory, to expiate our smaller offences, before the day of judgment. St. Isidore and Ven. Bede say the same. St. Bernard, speaking of heretics, says, they do not believe in purgatory: let them then inquire of our Saviour, what he meant by these words. — It is well known that Ven. Bede, on his death-bed, bestowed several small tokens to the monks who were present, that they might remember to pray for his soul in the holy sacrifice of the mass. (Haydock)