What should the theory of spiritual theory and mediumship seek to do?

It seems to me that the theory of spiritual healing and mediumship should place great emphasis on that which creates spiritual links, creates better spiritual links, and on that which opens and deobstructs the spiritual channels. The theory should concern itself principally with that which allows good spiritual results on one hand and that which prevents good spiritual results on the other. Theory therefore is mostly about creating better spiritual pathways and about removing obstructions to those pathways.