Many of the works of Hans Christian Andersen, who in addition to being severely depressed and self-doubting was also a devout Christian. Here's the end of the original "The Little Mermaid", with the nameless protagonist in Purgatory:
"Unseen we can enter the houses of men, where there are children, and for every day on which we find a good child, who is the joy of his parents and deserves their love, our time of probation is shortened. The child does not know, when we fly through the room, that we smile with joy at his good conduct, for we can count one year less of our three hundred years. But when we see a naughty or a wicked child, we shed tears of sorrow, and for every tear a day is added to our time of trial!"