Have you ever wondered why a third of the hosts of heaven left God to follow Satan? I have. I've spent hours of time wondering why, when presented with God's eternal Plan, some shouted for joy, and others left the service of God forever. When I was younger, I couldn't comprehend it. How could someone, faced with the prospective glories of exaltation, simply leave them behind? As an adult, I'm starting to understand.
We often talk about the Celestial Kingdom as if it is heaven, and everything else is a version of Hell. We Mormons haven't really left our Protestant ideas of glory or punishment behind. We act as though, by following the commandments and doing all that we have been commanded to the best of our abilities, we will be justified by our sacrifices, forgiven by Christ, and enter into the Father's presence. But it doesn't work like that.