It is a noteworthy fact, presaging the new form which modern civilization and enlightenment were to assume, that the heresies which were to shake the Church to its foundations were no longer, as of old, mere speculative subtleties propounded by learned theologians and prelates in the gradual evolution of Christian doctrine. We have not to deal with men like Arius or Priscillian, or Nestorius or Eutyches, scholars and prelates who filled the Church with the disputatious wrangles of their learning. Hierarchical organization was too perfect, and theological dogma too thoroughly petrified, to admit of this; and the occasional deviations, real or assumed, of the schoolmen from orthodoxy, as in the case of Berenger of Tours, of Abelard, of Gilbert de la Porée, of Peter Lombard, of Folkmar von Trieffenstein, were readily suppressed by the machinery of the establishment. Nor have we, for the most part, to deal with the governing classes, for the alliance between Church and State to keep the people in subjection had been handed down from the Roman Empire, and however much monarchs like John of England or Frederic II. had to complain of ecclesiastical pretensions, they never dared to loosen the foundations on which rested their own prerogatives. As a rule, heresy had to be thoroughly disseminated among the people before those of gentle blood would meddle with it, as we shall see in Languedoc and Lombardy. The blows which brought real danger to the hierarchy came from obscure men, laboring among the poor and oppressed, who, in their misery and degradation, felt that the Church had failed in its mission, whether through the worldliness of its ministers or through defects in its doctrine. Among these lost sheep of Israel, like the Goim, whom, neglected and despised by the rabbis, it was Christ's mission to bring into the fold, they found ready and eager listeners, and the heresies which they taught divide themselves naturally into two classes. On the one hand we have sectaries holding fast to all the essentials of Christianity, with antisacerdotalism as their mainspring, and on the other hand we have Manichæans.