We can judge of the merit of a system of morals but by its conformity with man's nature. According to this comparison, we have a right to reject it, if we find it detrimental to the welfare of mankind. Whoever has seriously meditated upon religion and its supernatural morality, whoever has weighed its advantages and disadvantages, will become convinced that they are both injurious to the interests of the human race, or directly opposed to man's nature. "People, to arms! Your God's cause is at stake! Heaven is outraged! Faith is in danger! Down upon infidelity, blasphemy, and heresy!" By the magical power of these valiant words, which the people never understand, the priests in all ages were the leaders in the revolts of nations, in dethroning kings, in kindling civil wars, and in imprisoning men. When we chance to examine the important objects which have excited the Celestial wrath and produced so many ravages upon the earth, it is found that the foolish reveries and the strange conjectures of some theologian who did not understand himself, or, the pretensions of the clergy, have severed all ties of society and inundated the human race in its own blood and tears. CLXXIII.--HOW THE UNION OF RELIGION AND POLITICS IS FATAL TO THE PEOPLE AND TO THE KINGS. The sovereigns of this world in associating the Deity in the government of their realms, in pretending to be His lieutenants and His representatives upon earth, in admitting that they hold their power from Him, must necessarily accept His ministers as rivals or as masters. Is it, then, astonishing that the priests have often made the kings feel the superiority of the Celestial Monarch? Have they not more than once made the temporal princes understand that the greatest physical power is compelled to surrender to the spiritual power of opinion? Nothing is more difficult than to serve two masters, especially when they do not agree upon what they demand of their subjects. The union of religion with politics has necessarily caused a double legislation in the States. The law of God, interpreted by His priests, is often contrary to the law of the sovereign or to the interest of the State. When the princes are firm, and sure of the love of their subjects, God's law is sometimes obliged to comply with the wise intentions of the temporal sovereign; but more often the sovereign authority is obliged to retreat before the Divine authority, that is to say, before the interests of the clergy. Nothing is more dangerous for a prince, than to meddle with ecclesiastical affairs (to put his hands into the holy-water pot), that is to say, to attempt the reform of abuses consecrated by religion. God is never more angry than when the Divine rights, the privileges, the possessions, and the immunities of His priests are interfered with.