Now the world forms not only a single animal, but also a plurality of animals; each of them, as far as it has a share in the singleness of the universe, is preserved thereby; but, in so far as this animal enters into the multiplicity of some other animal, he can wound it, or be wounded by it, make use of it, or feed on it, because it differs from itself as much as it resembles itself; because the natural desire of self-preservation leads us to appropriate what is suitable to itself, and in its own interest to destroy what is contrary thereto. Finally, each being, fulfilling its part in the universe, is useful to those that can profit by its action, and wounds or destroys those who cannot support it; thus plants are scorched by the passage of fire, and the little animals are dragged along or trampled by the greater. This generation and this corruption, this betterment and deterioration of things render easy and natural the life of the universe considered as a single living being. Indeed, it would not otherwise have been possible that the particular beings it contains should have lived as if they were alone, should possess their ends in themselves, and should live only for themselves; since they are only parts, they must, as such, concur in the ends of the whole of which they are parts; and, so far as they are different, they could not each preserve its own life, because they are contained in the unity of the universal life; neither could they entirely remain in the same state, because the universe must possess permanence, and because of the universe, permanence consists in ever remaining in motion. THE STARS' MOTIONS COMPARED TO A PREARRANGED DANCE.