But while Voltaire was a Theist--as Lord Brougham says,[4] "without any hesitation or any intermission, a Theist"--and was a firm believer in the existence of a Creator and ruler of the universe,--he was also an avowed opponent of Catholicism; and when not engaged in the production of works which have added dignity to the literature of France, his life was passed in open warfare with the church of Rome. To this church he was as sincerely opposed as Martin Luther, and although his methods of attack and opposition differed entirely from that of the great German reformer, who shall say that his efforts have not proved even more successful? Macaulay has shown[5] that no Catholic nation has become Protestant since the period of the Reformation; while on the other hand, no nation once Protestant, has returned to Catholicism. Each party has retained its own territory, and the only gain has been in favor of religious freedom. The sincere and earnest appeals of Luther, which convulsed Germany, produced but little or no effect on the versatile mind of France. But the brilliant writings of Voltaire were welcomed by his countrymen, and have not been without their influence on French civilization. And although France has not been claimed as a protestant nation, yet freethinkers have there attained great power and influence, whilst Germany, once the stronghold of Protestantism, is now the chosen and hospitable home of freethought. Voltaire in his day was an acknowledged leader of public opinion. His thoughts engrossed the attention of the world. "Whole nations," says Quinet,[6] "emulously repeat every syllable that falls from his pen:" and the lapse of time has but confirmed the verdict of his cotemporaries, that of all the great reformers, his writings are the most useful to mankind. "If we judge of men by what they have _done_" says Lamartine,[7] "then Voltaire is incontestably the greatest writer of modern Europe. No one has caused, through the powerful influence of his genius alone, and the perseverance of his will, so great a commotion in the minds of men; his pen aroused a world, and has shaken a far mightier empire than that of Charlemagne, the European empire of a theocracy. His genius was not _force_ but _light_. Heaven had destined him not to destroy but to illuminate, and wherever he trod light followed him, for reason (which is _light_) had destined him to be first her poet, then her apostle, and lastly her idol."