He belonged to the republic of letters, and did not understand that it should be ruled by the will of one man. And then, while he vehemently reprehended those authors who had made their literary enemies the objects of public satire, he, himself, indulged in the most bitter attacks. Frederic considered "Akakia" as a satire, deserved by Maupertuis, and thus a blameless source of merriment at his supper table, where he had no objection to turn his president into ridicule; but the publication was quite another affair; by this he considered his academy, and consequently himself, attacked; and he retaliated by a still more flagrant outrage. He caused the diatribe to be burnt by the hands of the hangman in the public square of Berlin. Voltaire had a right to be deeply incensed by this act. He did not attack the honour or morality of Maupertuis in his diatribe, but simply ridiculed his opinions; and though "Akakia" has only that slight merit, dependent on associations of the day, now lost, which rendered it amusing to a circle, and was not adapted for general reading nor posterity, still, as it was not libellous, the act of the king of Prussia was an insolent exertion of intolerable despotism. He meant, perhaps, to break Voltaire's spirit by such an insult. Knowing that he could not return to Paris, he fancied him at his mercy. Voltaire had, however, but one wish--to escape, and to feel himself once more free. On this outrage he instantly returned "the king's baubles," as he called them,--the key of chamberlain, his cross, and the brevet of his pension,--with these verses:-- "Je les reçus avec tendresse, Je les renvoie avec douleur, Comme un amant, dans sa jalouse ardeur, Rend le portrait de sa maitresse." Thus trying to soften the acquisition of his freedom to Frederic himself. He at the same time said that he was ill, and asked permission to drink the waters of Plombières. The king, desirous of keeping him on his own terms, replied by sending some bark, and, observing that there were as medicinal waters in Silesia as at Plombières, refused permission for his journey.