The Summary of Physics Restored

207Since the structure of the Universe is a single body, a single universal Nature composed of many natures and bodies as parts held together through their intermediaries and bonds, it should not seem strange that these members are joined to one another by a strong, though hidden, bond and lend each other mutual aid. For these manifold natures have not merely a relation but also communication and a kind of commerce: the extremes through intermediaries, and the intermediaries through their neighbours. This communication takes place through emissary spirits. Every region of the World and every nature, even an individual nature, abounds in spirits. Many continually flow out and give way to those flowing in. Through the constant arrival and departure of spirits there is thus a kind of renewal of the World’s parts and natures. This is the ladder of universal Nature revealed in a vision to the patriarch Jacob. These are Mercury’s wings, by whose aid he, mystically called the messenger of the Gods by the ancients, was believed frequently to visit the thresholds of the upper and lower worlds.