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What is Spiritism? > Chapter II—Elementary notions of Spiritism > The Consequences of Spiritism > 101
101. Let us say that spirits are incapable of teaching us anything that we don't already know or that we cannot find out about by ourselves; even then, the mere proof of the spirit world's existence should be enough to bring about a revolution in thought. Now, a revolution in thought necessarily leads to a revolution in the order of things, and it is this revolution that Spiritism is preparing.