In magical thought the human body is the 'microcosm' (small representation) of the Earth, which is the 'macrocosm'. The Earth is also the microcosm of the Universe. In other words, we are pictures of the essence of the planet and thusly of the universe. As such, when we change ourselves, we change the Earth and the universe.
Earth Power: Techniques of Natural Magic (ed. Llewellyn Worldwide, 1983) - ISBN: 9780875421216