Clive Staples ( Jack ) Lewis (1898-1963) was best known as a Christian apologist. He wrote many books on theology, as well as science fiction and fantasy. C.S. Lewis was one of the most influential apologists of the 20th Century. Even though he was an Anglican, he had similar views to Catholicism, most notably on Purgatory as the following excerpt from Letters to Malcom shows.
Of course I pray for the dead. The action is so spontaneous, so all but inevitable, that only the most compulsive theological case against it would deter me. And I hardly know how the rest of my prayers would survive if those for the dead were forbidden. At our age, the majority of those we love best are dead. What sort of intercourse with God could I have if what I love best were unmentionable to him?
I believe in Purgatory.
Mind you, the Reformers had good reasons for throwing doubt on the Romish doctrine concerning Purgatory as that Romish doctrine had then become.
The right view returns magnificently in Newman’s Dream . There, if I remember it rightly, the saved soul, at the very foot of the throne, begs to be taken away and cleansed. It cannot bear for a moment longer With its darkness to affront that light . Religion has claimed Purgatory.
Our souls demand Purgatory, don’t they? Would it not break the heart if God said to us, It is true, my son, that your breath smells and your rags drip with mud and slime, but we are charitable here and no one will upbraid you with these things, nor draw away from you. Enter into the joy Should we not reply, With submission, sir, and if there is no objection, I’d rather be cleaned first. It may hurt, you know Even so, sir.
I assume that the process of purification will normally involve suffering. Partly from tradition; partly because most real good that has been done me in this life has involved it. But I don’t think the suffering is the purpose of the purgation. I can well believe that people neither much worse nor much better than I will suffer less than I or more & The treatment given will be the one required, whether it hurts little or much.
My favorite image on this matter comes from the dentist’s chair. I hope that when the tooth of life is drawn and I am coming round , a voice will say, Rinse your mouth out with this . This will be Purgatory. The rinsing may take longer than I can now imagine. The taste of this may be more fiery and astringent than my present sensibility could endure. But . . . it will [not] be disgusting and unhallowed.
C.S. Lewis, Letters To Malcom: Chiefly on Prayer, chapter 20, paragraphs 7-10, pages 108-109