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Written by a Roman Catholic priest in 1881, this book on Heaven contains some very good parts. I love his focus on how seeing the glory of God in Heaven will make us happy; how - even though Heaven has so many other good things to fully satisfy all the senses God has given us - it's God Himself who is the chief and fullest blessing of Heaven. I hadn't fully appreciated that before reading this.
Another major point of his, I still need to chew on: that we in Heaven will have different capacities for seeing God's glory and thus different capacities for joy. It's compatible with Scripture, but he largely supports this with other citiations, so I (as a Protestant) am left unusure what to think. I'll need to study this question this some more. (Also, there are of course a few chapters that I as a Protestant reject (such as on Mary and on blessings for religious vows).)