Some spirits wanted to know what heavenly joy was, so they were allowed to feel it to the point that they could not bear any more. Still, this was not angelic joy, but only the slightest trace of the angelic quality that they were allowed to observe and share. It was so slight that it was almost cool, yet they called it most heavenly because it was so deep within them. I could tell from this not only that there are levels of heavenly joy, but also that the deepest level of one individual barely touches the outmost or some median level of another. I could also see that when we do reach our own deepest level we are in our own heavenly joy and that we could not bear anything deeper because it would become painful for us.
Some spirits who were not evil settled down into a peaceful state, rather like sleep, and in this way were taken into heaven in respect to the deeper levels of their minds; for before the deeper levels of their minds are opened, spirits can be taken into heaven and taught about the happiness of the people who live there. I saw them rest quietly for half an hour and then return to the outer consciousness they had been in before, but with a memory of what they had seen. They said that they had been with angels in heaven and had seen and perceived stunning things all gleaming like gold and silver and precious gems, in amazing forms that varied bewilderingly. They said that the angels took no particular delight in these outward things but in what they represented—unutterable, divine things of infinite wisdom; these were their real joy. There were countless other things that human language could not describe, not a ten-thousandth part, things that would not fit into any concepts that had anything material about them.
from Heaven and Hell, Sections 410, 411