post-Macedonian and the Roman domination, looked back to pagan Athens as to an irrecoverable greatness. In that case, if we are to assume comparative equality of culture between the sexes, there is no escape from the conclusion that Christianity was in itself a force of fixation or paralysis, the subsequent counteraction of which in Europe was a result of many causes--of any cause but the creed and lore itself. The creed, in fact, was a specific cause of isolation, and so of intellectual impoverishment. As was well said by Gibbon, the mental paralysis of the Byzantines was "the natural effect of their solitary and insulated state."[368] The one civilisation from which Byzantium might latterly have profited--the Saracen--was made tabu by creed, which was further the efficient cause of the sunderance of Byzantine and Italian life. Had the external conditions, indeed, permitted of the maintenance of the earlier manifold Empire of Constantine, the mere conditions of social diversity which prepared the countless strifes of speculative sects in Egypt and Syria might have led to intellectual progress, were it only by arousing in the more rational minds that aversion to the madness of all the wrangling sects which we detect in Procopius.[369] The disputes of the Christians were indeed the most absurd that had ever been carried on in the Greek tongue; and in comparing the competing insanities it is hard to imagine how from among themselves they could have evoked any form of rational thought. But as in Northern Europe in a later age, so in the Byzantine Empire, the insensate strifes of fanatics, after exhausting and decimating themselves, might have bred in a saner minority a conviction of the futility of all wars of creed--this if only external peace could have been secured. But the attacks, first of Persia and later of Islam, both determined religious enemies, with whom, on Christian principles, there could be no fruitful intercourse, shore away all the outlying and diversified provinces, leaving to Byzantium finally only its central and most homogeneous section, where the power of the organised Church, backed by a monarchy bent on spiritual as on political unity, could easily withstand the slight forces of intellectual variation that remained. The very misfortunes of the Empire, connected as they were with so many destructive earthquakes and pestilences,[370] would, on the familiar principle of Buckle, deepen the hold of superstition on the general mind. On the other hand, the final Christianising of the Bulgarian and Slav populations on the north, while safeguarding the Empire there, yielded it only the inferior and retarding culture-contact of a new pietistic barbarism, more childish in thought than itself. We can see the fatality of the case when we contemplate the great effort of Leo the Isaurian in the eighth century to put down image-worship by the arm of the executive. No such effort