Learn about The unseen world – an exposition of Catholic theology :
The attempt to hold intercourse with the inhabitants of the unseen world is not, as some seem to imagine, a practice peculiar to these modern times. It was resorted to long before the Greeks inquired of Apollo in his temple at Delphi through the mouth of the Pythoness and before the Romans consulted the Sibylline oracles at Cumae and at Tibur. Nor is it a practice confined to civilized and cultivated races. The savage man, too, in his lonely hut on his desert island, has at all times been in the habit of evoking the spirits of the other world, whether he believed these spirits to be genii, disposed to favour and to benefit mankind, demons bent on working harm or mischief, or the souls of the dead seeking for rest amidst their former haunts and environments History records how extensively spiritistic practices were carried on during the middle ages, and what severe laws, both civil and ecclesiastical, had to be enacted in order to check what was then held to be a dangerous and harmful superstition.