28. When the spirits have acquired over a world the degree of progress comporting with the state of that world, they quit it in order to dwell upon another more advanced, where they acquire new knowledge, and so on in succession until incarnation, in a material body, being no longer of use to them, they live exclusively in the spiritual life, where they still progress in other ways and by other means. Arrived at the culminant point of progress, they enjoy supreme felicity. Admitted into the counsels of the Almighty, they have his thought, and become his messengers, his ministers for the government of worlds, having under their charge spirits of various degrees of advancement.
Thus all spirits, incarnated or discarnated, of whatever degree of the hierarchy to which they belong, from the lowest to the highest, have their attributions in the great mechanism of the universe. All are useful to the whole; at the same time they are useful to themselves. To the least advanced is incumbent a material task, a simple maneuver, at first unconscious, then gradually intelligent. Everywhere there is activity in the spiritual world; nowhere is there useless idleness.
The collective body of Spirits is, in a manner, the soul of the universe; it is the spiritual element which acts over all and through all, under the impulsion of the divine thought. Without this element, there is only inert matter, without object, without intelligence, without other motor power than material forces, which leave a crowd of insoluble problems. By the action of the individual spiritual element, all has an object, a reason for being; all explains itself; that is why, without spirituality, one is hurled against insurmountable difficulties.