CHAP. V. On the Soul. Different opinions of the Ancient Philosophers on the nature of the Soul. Arguments of Descartes refuted. Author's exposition on the subject. CHAP. VI. On the Spirits named Demons. Origin and falsity of the opinions as to their existence. A TREATISE ON THE THREE IMPOSTORS. CHAP. I.--OF GOD. § 1. Although it is important that all men should know the truth, there are nevertheless few who enjoy this advantage; some are incapable of finding it out unassisted, and others will not put themselves to the trouble. It is not to be wondered at therefore, if the world is filled with vain and absurd opinions; and nothing is more adapted to spread them than ignorance, which is the sole originator of the false ideas which prevail as to the Divinity, the Soul, the existence of Spirits, and almost all the other subjects which go to make up Theology. Custom is powerful--men rest contented in the prejudices of their birth, and leave the care of the most essential matters to interested parties, who make it a rule to uphold with bigotry the received opinions, and who dare not overturn them lest in so doing they should destroy themselves. § 2. What renders the evil without remedy is this, that, after having established these false ideas of the Divinity, they neglect no plan to compel the people to believe in them, without permitting any one to examine for himself. On the contrary, they have excited a hatred against philosophers--the truly learned, lest the doctrines which they would teach should lead to the exposure of those errors in which they have plunged mankind. The advocates of these foolish notions have succeeded so well, that it is dangerous to combat them. It is too much the interest of those impostors that the people be ignorant, to permit them to become enlightened. Thus the truth must either be kept in abeyance, or its promoters be prepared to be sacrificed at the shrine of a false philosophy, and to suffer from the rage of grovelling and interested minds. § 3. If the people could understand into what an abyss they are sunk by ignorance, they would speedily shake off the yoke of their unworthy leaders, for it is impossible not to discover the truth when reason is left to its unrestrained exercise.