Balthazer Bekker, "a man who feared neither man nor devil," was the first Rationalist in the Dutch church. He was a disciple of Des Cartes, and an ardent lover of natural science, particularly of astronomy. He published a work on Comets, in which he combated the old notions, prevalent among his countrymen, that a comet was always the precursor of heresies and all manner of evils, and that it should be made the occasion for a general call to prayer and fasting. Bayle, of Rotterdam, a reputed atheist, harmonized with Bekker. Bekker separated between the sphere of reason and that of religion. Whenever they meet each other it should be as friends and co-workers. Religion has greater dignity, but that gives it no right to disregard the authority of reason. When the Scriptures speak in an unnatural way of natural things, it is high time for the operation of reason. This idea led to the accommodation-theory, which, applied to the doctrine of spirits in his book, _The World Bewitched_ (1691), resulted in Bekker's excommunication. His Cartesianism, which had taught him to distinguish so rigidly between the two "substances," matter and spirit, as to deny all action of the one upon the other, led him to assert that spirits, whether good or bad, have no influence upon the bodies of men. The Jews ascribed all exertion of power to angels, through whom God worked mediately. Jesus adapted himself to these ideas of his times. Bekker loved to trace all spirit-stories to some plausible origin, and then to hold them up to the ridicule of the masses. To give substantial proof of his disbelief in all spiritual influence, he passed many nights in graveyards, on which occasions he manifested a sacrilegious hardihood, which, besides making him the wonder of his time, could only be accounted for by supposing that he kept up secret correspondence with the devil. "For," reasoned the Dutch theologians, "is not all this one of Satan's tricks to make us believe that he does not exist, so that he may capture us unawares?" On account of Bekker's acknowledged merit, the government took his part, and at his death, paid his salary to his family. Voltaire said of him: "He was a very good man, a great enemy of the devil and of an eternal hell.... I am persuaded that if there ever existed a devil, and he had read Bekker's _World Bewitched_, he would never have forgiven the author for having so prodigiously insulted him." In the library at Utrecht there are ten quarto volumes containing reviews of this book, in which Bekker's personal appearance, said to have been very unprepossessing, receives a goodly portion of the censure. His body was believed by his contemporaries to be a most excellent portrait of the devil himself.