29. When the Earth is found in climatic condition suited to the existence of the human species, spirits come to be incarnated there. Where did they come from? Whether these spirits may have been created at such moments or whether they may have come completely formed from space, from other worlds, or from the Earth itself, their presence on it, occurring from a certain epoch is a fact, as before them there existed only animals. They were covered with bodies suitable to their special needs and aptitudes, which physiologically pertained to animalism. Under their influence, and by the exercise of their faculties, their bodies were modified and perfected. This is what observation has proved. Leaving aside the question of origin, unsolved till now, and considering the Spirit, not at his point of origin but at the moment the first germs of free will and moral sense were manifested, we see him carrying out his humanitarian role, without concerning ourselves with the ambient in which he spent his infancy or his incubation period. Despite the analogy of his physical garment with those of the animals, due to his intellectual and moral faculties, which characterize his spirit, we will know how to differentiate him from the animal, just as we can distinguish a rustic man from a civilized when they are both wearing the same garments.