One of the things that I liked most about The Weight of Glory was the drastic difference that CS Lewis explains between those that are acknowledged by God, and those that are denied by God; the former gets eternal glory in heaven, and the latter gets eternal death in hell.
Lewis describes the promises that Scripture gives of heaven in five heads. He then goes on to explain that the first head is the only one that really matters, because being with Christ is all the glory we could ever have. All the other heads were symbols. Being with Christ leads to the rest of all these glories.
I have also come to realize that Lewis ties many of his writings together. Our English Syllabus talks about how some of things that we do not want to learn are the building blocks that lead to what we want to learn. The Weight of Glory relates to this when Lewis explains that there are many things that we do in this life that does not seem at all related to the glory that we will receive in heaven, but in reality they put us on the path to that glory.