Here is an example of something I have, tried to purge many times, can not, but also can not see myself actually ever reading. The Gulag Archipelago, by Solzhenitsyn.
A classic. People either rave or roll their eyes, or start blankly when this title is mentioned. I have never heard, "Well, it was alright. " I fell entirely void of the intellect needed to read and understand this book. And yet, I feel in needs to be read. So I put it back on my shelf.
Another. Small is Beautiful, by E.F. Schumacher. I actually read portions of this book in college, and wholeheartedly, in a completely idealistic way, support the premise here. But will I ever really read this book again? Somehow, I doubt it. Same with Pilgrim at Tinker Creed, by Annie Dillard. Loved it in college. Own it, probably won't read it again. And so on. I am spinning my wheels here. As I go through the shelves, I have maybe eliminated 5 books. Out of 5 book cases full. This is not good. I need to pray more about this, I can see that for certain!