The entire scope of what we call knowledge is nothing more or less than what we experience and what we imagine.
I believe that spirit is pure potential, as spirit is inherently non-physical, and the only thing that cannot physically exist is potential. I also believe that our imaginations are our sixth sense: a direct sense of potential, and therefore a direct sense of the spirit world (albeit not a complete, innate understanding of the spirit world).
In energetic terms, the spirit world is equivalent to potential energy, whereas the physical world is equivalent to kinetic energy. In the spirit world, there are no limits such as exist in physicality. Time and space exist infinitely and simultaneously. I believe that potential itself is likewise infinite, insofar as there is some possibility for everything imaginable to happen or exist. Meanwhile the physical world is an instance of some set of potentials manifesting as a reality that is limited by the myriad variables put in place starting when this universe began. It is possible that all potentials do manifest in alternate universes; I have a feeling that this is the case. However, the difference is still that the spirit world is completely without limit and since all things exist in potential simultaneously, nothing ever actually changes there. The spirit world has all the wisdom and timeless perspective possible, meanwhile the physical world is where real change and growth can happen.
The spirit world and the physical world, potential and actuality, need each other and dream each other into existence.
I said above that the spirit world is closely tied to the imagination – but this is not at all to say that spirit is any less real. Spirit by definition does not physically exist; but neither does potential energy. Our imagination is our best source of information about non-physical things. Stop denigrating the imagination as if non-physical things that we dream or otherwise sense are less valid than non-physical things that are not contained in our imagination. People often say, “I didn’t imagine it!” when talking about non-physical things, which is something of a confusion. What people seem to mean is that the non-physical event had a certain physicality about it, which made the incident feel more “real” than otherwise. But that is like saying a body of water had a certain fire-ness about it, and that fire is more real than water, so the “fire-like” water is also more real. They are just different.
Both the physical and the non-physical are real, end of story. In which case we can begin to use our imagination as a true sixth sense and brilliant tool to learn about the spirit world. Shamanic journeys, for instance, may in fact take place entirely in the imagination, and many traditional shamans remark that this is of no consequence whatsoever.
When our imagination can be embraced rather than exiled, so many difficulties in getting to know spirit fall away. We can stop worrying about what is real and what isn’t (a useless question anyway, since as I said, the entire scope of what we call knowledge is nothing more or less than what we experience and what we imagine). We can journey deeper and more wildly and easier than ever before.