The study of the works of Giordano Bruno, which has been revived and extended during this century, is one evidence of a more general toleration, and of a healthy desire to know the opinions of all kinds of thinkers. One reason why Bruno has attracted modern investigators is because so many of his doctrines are in tune with recent metaphysical and scientific theories; and it seems probable that, for a while at least, the interest awakened in him will increase rather than diminish, until, after the republication and examination of all his writings, a just estimate of his speculations shall have been made. Much will undoubtedly have to be thrown out as obsolete or fanciful; much as flippant and inconsistent; much as vitiated by the cumbrous methods of scholasticism, and the tedious fashion of expounding philosophy by means of allegory and satire. But, after all the chaff has been sifted and all the excrescences have been lopped off, something precious will remain. The very diversity of opinions about the upshot and value of his teaching insures for him the attention of scholars for some time to come. Those thinkers who can be quickly classified and easily understood are as quickly forgotten; only those who elude classification, and constantly surprise us by turning a new facet towards us, and provoke debate, are sure of a longer consideration. And see how conflicting are the verdicts passed upon Bruno. Sir Philip Sidney and that fine group of men who just preceded the Shakespearean company were his friends, and listened eagerly to his speculations. Hegel says: “His inconstancy has no other motive than his great-hearted enthusiasm. The vulgar, the little, the finite, satisfied him not; he soared to the sublime idea of the Universal Substance.” The French _philosophes_ of the eighteenth century debated whether he were an atheist; the critics of the nineteenth century declare him to be a pantheist. Hallam thought that, at the most, he was but a “meteor of philosophy.” Berti ranks him above all the Italian philosophers of his epoch, and above all who have since lived in Italy except Rosmini, and perhaps Gioberti. Some have called him a charlatan; some, a prophet. Finally, Leo XIII, in an allocution which was read from every Romish pulpit in Christendom, asserted that “his writings prove him an adept in pantheism and in shameful materialism, imbued with coarse errors, and often inconsistent with himself;” and that “his talents were to feign, to lie, to be devoted wholly to himself, not to bear contradiction, to be of a base mind and wicked heart.” As we read these sentences of Leo XIII, and his further denunciation of those who, like Bruno, ally themselves to the Devil by using their reason, we reflect that, were popes as powerful now as they were three centuries ago, they would have found reason enough to burn Mill and Darwin, and many another modern benefactor.