32. One can see by these few explanations that there is nothing supernatural or extraordinary about spirit manifestations. They are phenomena induced according to the law that governs the exchange between the visible and invisible worlds, a law as natural as the law of electricity, gravity, etc. Spiritism is the science that enables us to know about this law, just as mechanics enables us to know about the law of motion, and optics, the law of light. Being part of nature, spirit manifestations have been produced in all ages; once understood, the law governing them explains a series of problems that used to be considered insolvable; it is the key to a multitude of phenomena exploited and amplified by superstition.
