But if the adversaries become heated in the dispute, which always happens, when they suppose the matter important, or when they would defend the cause of their own self-love; from thence their passions sharpen, they grow angry, quarrels are provoked, they hate each other, and end by reciprocal injury. It is thus, that for opinions, which no man can demonstrate, we see the Brahmin despised; the Mahommedan hated; the Pagan held in contempt; that they oppress and disdain each with the most rancorous animosity: the Christian burns the Jew at what is called an _auto-de-fe_, because he clings to the faith of his fathers: the Roman Catholic condemns the Protestant to the flames, and makes a conscience of massacring him in cold blood: this re-acts in his turn; sometimes the various sects of Christians league together against the incredulous Turk, and for a moment suspend their own bloody disputes that they may chastise the enemies to the true faith: then, having glutted their revenge, return with redoubled fury, to wreak over again their infuriated vengeance on each other. If the imaginations of men were the same, the chimeras which they bring forth would be every where the same; there would be no disputes among them on this subject, if they all dreamt in the same manner; great numbers of human beings would be spared, if man occupied his mind with objects capable of being known, of which the existence was proved, of which he was competent to discover the true qualities, by sure, by reiterated experience. _Systems of Philosophy_ are not subject to dispute but when their principles are not sufficiently proved; by degrees experience, in pointing out the truth and detecting their errors, terminates these quarrels. There is no variance among _geometricians_ upon the principles of their science; it is only raised, when their suppositions are false, or their objects too much complicated. _Theologians_ find so much difficulty in agreeing among themselves, simply, because, in their contests, they divide without ceasing, not known and examined propositions, but prejudices with which they have been imbued in their youth--in the schools--by each other's books, &c. They are perpetually reasoning, not upon real objects, of which the existence is demonstrated, but upon imaginary systems of which they have never examined the reality; they found these disputes, not upon averred experience, or constant facts, but upon gratuitious suppositions, which each endeavours to convince the other are without solidity. Finding these ideas of long standing, that few people, refuse to admit them, they take them for incontestible truths, that ought to be received merely upon being announced; whenever they attach great importance to them, they irritate themselves against the temerity of those who have the audacity to doubt, or even to examine them.