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What is Spiritism? > Chapter II—Elementary notions of Spiritism > The Consequences of Spiritism > 103
103. The smallest causes can produce the largest effects; thus it is that, from a small seed arises a huge tree; that the fall of an apple leads to the discovery of the law that governs worlds; that frogs twitching on a plate revealed the galvanic force; it was also thus that, from the ordinary phenomenon of the turning tables arose proof of the invisible world, and from such proof a doctrine that in just a few years has crossed the world and can regenerate it simply by providing evidence for the reality of the future life.