5. Spirits who find themselves incarnated in any world are not bound to that same world indefinitely, nor do they go through all the phases of progress needed to achieve perfection in that one world. When they reach the maximum degree of advancement their world has to offer, they then pass on to a more elevated one, and so on successively till they reach the state of purified Spirits. These different worlds are stations where the Spirits find the elements they need for their progress that are in accordance to their degree of perfection. It is a recompense to ascend to a world of higher elevation, just as it is a punishment to prolong their stay in a miserable world, or to be relegated to another even more unhappy than the one they were forced to leave, due to persisting badness.