"Whatever suffering it may cost you in your earthly life, whatever inconceivable purification it may cost you after death"

Lewis here leaves room in his theology for the existence of purgatory, "a place or condition of temporal punishment for those who, departing this life in God's grace, are, not entirely free from venial faults, or have not fully paid the satisfaction due to their transgressions" (The Catholic Encyclopedia). The Anglican Church officially rejects the doctrine, as do other Protestant denominations, but Lewis believed in it, as he evidenced in his Letters to Malcolm, quoted here.