These ideas Burke more fully developed in his famous "Reflections on the Revolution in France" (1790); liberals maintained that by this work he had deserted the cause of liberty; conservatives asserted that he had become the stoutest champion of order combined with rational freedom. It must be acknowledged that Burke erred by judging the state of France before the revolution too favorably; if he justly appreciated the pernicious influence of Rousseau, "that great professor and hero of vanity," he ought to have discerned that a nation, the higher classes of which were undermined by materialism and unbelief, while the masses lived in deep misery, was incapable of a temperate reform; the follies and terrors of the revolution were the children of the sins of the "ancien regime." But how amply has history confirmed his judgment on the revolution itself! While Fox admired the constitution of 1791 as "the most astonishing and glorious edifice of liberty that ever was erected," Burke foresaid that this constitutional king would be torn from his throne by the mob, that the wildest anarchy would put France in confusion, and that after its exhaustion an unlimited military despotism would be established. This work, which produced a European sensation, receives its true light by Burke's "Appeal from the New to the Old Whigs" (1791). His former friends having sided with Fox, he refuted the reproach of having abandoned his principles by an elaborate comparison of the English revolution of 1688 with that of France. His later writings, among which the "Thoughts on French Affairs" (1791) and "Thoughts on a Regicide Peace" (1796) are the principal, were directed against the foreign influence of the revolutionary system, "France being no more a state but a faction, which must be destroyed or will destroy Europe." Here again Burke was wrong; if France was a revolutionary crater, the safest way was to let it burn out in itself, while the insane aggression of continental powers only confirmed the reign of terror. Burke would go to war for the idea of prescriptive right; Pitt declined to fight for the French monarchy, and would make war only for the defence of English interests. Although Burke had the satisfaction of gaining the majority for his views, he retired from Parliament in 1794; a pension which he obtained he defended in the "Letter to a Noble Lord," a dignified plea, "pro domo." One of his last works was "Thoughts and Details on Scarcity" (1795). In a time when political economy was still in a state of infancy, he held the most enlightened opinions on all questions relating to it; his doctrines on prices, wages, rent, etc., are still worth reading. Above all, he opposes indiscreet government tampering with the trade of provisions. "Once habituated to get cheap bread, the people will never be satisfied to get it otherwise, and on the first scarcity they will turn and bite the hand that fed them."