This may seem an odd request, but I am wondering if Logos has books that explain what Lewis meant. I am thinking today of his line from The Great Divorce, "Heaven, once attained, will work backwards and turn even that agony into a glory."
I have the Lewis collection. I am wondering about this
https://www.logos.com/product/49458/studies-on-cs-lewis-collection
or
https://www.logos.com/product/49483/sehnsucht-the-cs-lewis-journal
this one is another possibility, but seems less likely to be helpful.
https://www.logos.com/product/49751/eerdmans-cs-lewis-collection
Does anyone who has any of these care to comment about what would be most helpful?