Let me jump in the conversation and share a few thoughts about the difficulties in describing consciousness, mind and soul.
You’re not alone. For centuries, maybe millennia, philosophers, theologians and all kind of thinkers have wrestle with the same problem. I suggest you first examine your own assumptions, conceptions and preconceptions about them. If you think that you do not have any, what it means is that they have become hidden. Find them and bring them to the surface.
I think there are two perspectives from which one can describe consciousness, mind and soul. One is as emergent phenomena. That is, they are biologically based. Matter is first. You can research the scientific literature supporting this assumption. The other assumption is that they are not emergent but fundamental. There is also literature in support of this assumption but not in the field of objective science.
My suggestion is not to mix the two perspectives to avoid confusion. They are both valid. I think Campbell understood both. Maybe he had a preference for one. It might be interesting to explore that.