To Voltaire reason and humanity were but a single word, and love of truth and passion for justice but one emotion. None of the famous men who have fought, that they themselves might think freely and speak truly, has ever seen more clearly that the fundamental aim of the contest was that others might live happily. Who has not been touched by that admirable word of his, of the three years in which he labored without remission for justice to the widow and descendants of Calas--"During that time not a smile escaped me without my reproaching myself for it as for a crime"? Or by his sincere avowal that of all the words of enthusiasm and admiration which were so prodigally bestowed upon him on the occasion of his last famous visit to Paris in 1778, none went to his heart like that of a woman of the people, who in reply to one asking the name of him whom the crowd followed gave answer, "Do you not know that he is the preserver of the Calas?" The same kind of feeling, though manifested in ways of much less unequivocal nobleness, was at the bottom of his many efforts to make himself of consequence in important political business. We know how many contemptuous sarcasms have been inspired by his anxiety at various times to perform diplomatic feats of intervention between the French government and Frederick II. In 1742, after his visit to the Prussian King at Aix-la-Chapelle, he is supposed to have hinted to Cardinal Fleury that to have written epic and drama does not disqualify a man for serving his king and country on the busy fields of affairs. The following year, after Fleury's death, when French fortunes in the war of the Austrian succession were near their lowest, Voltaire's own idea that he might be useful from his intimacy with Frederick seems to have been shared by Amelot, the secretary of state, and at all events he aspired to do some sort of active, if radically futile, diplomatic work. In later times when the tide had turned, and Frederick's star was clouded over with disaster, we again find Voltaire the eager intermediary with Choiseul, pleasantly comparing himself to the mouse of the fable, busily striving to free the lion from the meshes of the hunter's net.