The Spirits' Book by Allan kardec - O Livro dos Espíritos em inglês
"Spirits exert an incessant action upon the moral world, and even upon the physical world; they act both upon matter and upon thought, and constitute one of the powers of nature, the efficient cause of many classes of phenomena hitherto unexplained or misinterpreted, and of which only the spiritist theory can give a rational explanation.´´ Allan Kardec
