What is unseen except in its outcome?

In your world, you have the visible, physical life in all stages of development and in all forms—the rock, the flower, the animal, and the man. You have, also, mental life in all stages, from the simplest animal instinct to the most complex brain of man. 

So, in our world, we have the psychic life in all stages—that life, which may be said to be outward and visible to our psychic senses. We have, also, the spirit life, unseen except in its outcome, as it manifests itself through the psychic.

Thus, we have trees and stones, animals and man—all with the same kind of life running through them, but not to the same degree.