Enlightenment is personal understanding. Not certainty perhaps, but a general agreement about how the Universe works.
What kinds of things?
Such "things" as the doctrine of original sin, or the purpose and meaning of sacrifice.
And why do you trust that that enlightenment corresponds to truth?
It doesn't even have to, but it is my compass direction to follow.
Speaking of comfort, these matters are painfully introspective for me, and possibly not a fit subject for this casual discussion arena. I'm ready for a beer, and there aren't any in the house.