"Okay. I don't normally teach introductory classes, so let me know if anything is especially unclear.
When a human dies, their soul goes to the Labyrinth - which is probably not really a 'place', but one of our Doctrines is that you can't actually really understand it unless you're already about to transcend it, so don't get too hung up on that, I suppose.
They stay in the Labyrinth for some amount of time, and are then reborn in a new body, without direct access to their previous memories.
We know things about this because we can unlock those memories - but only very partially, and only with a very expensive substance that it takes a considerable amount of the Empire's productive capabilities to produce. We call the substance 'true liao' and the unlocking a 'past life vision'.
Due to this ability, we have also managed to deduce some other things about how this works. There are fundamental drives in human nature - probably the nature of all sentients, but our research has been primarily on humans - that we call Virtues. Some of these Virtues help a soul move faster through the Labyrinth - we call those True Virtues. Our current list is Wisdom, Prosperity, Ambition, Courage, Vigilance, Pride and Loyalty, which is fairly stable but there have been changes in the past when new evidence has been presented.
Some individuals that should have gone very fast through the Labyrinth instead don't come back at all - but do have, uh, variously documented effects on the world after their death. We call these individuals Paragons, and say they have transcended the Labyrinth and gone beyond it. The documented effects are mostly visions, and also sometimes what we call 'miracles' - effects that are not explainable in other ways, often to do with auras but not always.
Auras are, I suppose, a side topic in religion - the refined vinum that doesn't become true liao creates a substance that's just called liao, which lets properly trained priests leave auras of a virtue on places, people, and things. Only humans can successfully take liao out of the people we've tried it on; orcs can't stomach it and reject it rather messily, heralds have a range of effects but none are the normal one. Humans, and possibly orcs although this is controversial, can also leave these auras just by getting into a mindset extremely aligned with the Virtue in question - this is one of the most usual forms of miracle - but it happens rarely enough to be called that.
Are you following so far? There are a lot of edge cases, the words for the Virtues are a little misleading in places and could generally do with detailed exposition, and I haven't really mentioned Exemplars or the religious laws yet, but that is the fundamental basis of our faith."