The animistic phase goes from the atom to the higher animal. In this period, the spiritual principle is developed naturally by the impulse of the pleasures and pains, then governed by the instincts and passions, elaborating itself through the evolution of species. Then comes the human life, when the intellectual-moral evolution occurs. The soul, at this stage, begins simple and unlearned, that is, without morality and intelligence. In the first few lives, not much change is affected, Kardec explains, continuing the spirit under the infallible command of the instincts. After hundreds or thousands of lives, reason starts to bring forth the understanding. Only then does free will develop the capacity for rational choice, that is, with an understanding of the options. Only then the spirit becomes responsible for both the mistakes made and the progress made. Finally, when the spirit awakens its virtues, and overcoming all imperfections contracted over the time, it begins to assume missions in the universe. It assists another spirit to overcome its difficulties, become the guardian spirit of someone else, help a family, a group, a nation, a planet. It can then participate in the creation and evolution of the species of a planet, then acquire responsibilities to an entire solar systems, then galaxies and so forth. The co-creative spirits assist God in the establishment of universal harmony, voluntarily and cooperatively.