It soon became obvious that Johanne Agerskov was an intermediary, and they formed a circle together with two other couples, and held séances, because they were told that they before their incarnation had promised to take on the task of being the instrumental to bring to mankind some truths from the transcendental world.
The passage describes Johanne Agerskov's role as an intermediary in a spiritual circle where they were instructed to bring transcendental truths to mankind through séances. This suggests a belief system centered around reincarnation and the transmission of knowledge from beyond the physical realm.