It is most important to remember that the scholastic philosophers were in all cases clerics, representative of, and not antagonistic to, Catholic theology; that even the Averrhoïsts were also clerics, having no desire to break with the Church. On the other hand, the freedom of thought which the universities stood for and dialectic fostered, and which the Church not only did not repress, but even encouraged, had a tendency to produce heresy. Realism evolved pantheism; nominalism unitarianism. The intellectual influences of university life brought forth Gerson, D’Ailly and the other whole-hearted reformers who made the great effort at revival of the Church from within which failed at Constance and Basel; but it also brought forth Wycliffe and Hus, whom those Councils condemned. It was never absolutely clear where the dividing line between orthodoxy and heresy would rest. However much they might be reconciled or confused, the ideals and methods of theology and philosophy cannot be the same. The postulates of the one are not those of the other; and the more the scientific spirit is developed, the fewer the postulates of any sort that it is ready to accept. The Averrhoïsts at least saw this, only saving their position by the equivocation of the double truth. Which was really the more dangerous to Catholic doctrine—the organized heresies, as a rule ignorant, perverted, having the seeds of their own destruction in their very rottenness, which the Church did systematically persecute; or the philosophical speculations of the universities, with their temptations to rationalism which the Church in the main tolerated?[478] Each produced a force not wholly transient—a force operative in the breaking up of the mediæval system. The first was anti-sacerdotalism; the second a habit of independent thought and criticism. It is true that the anti-sacerdotalism of Luther and the secular spirit of Renaissance humanism, with its entire indifference to religion, were the decisive factors in breaking up the fabric of mediævalism, and the movements of Lutheranism and humanism were largely new creations. Yet Luther owed much to Hus, and Hus everything to Wycliffe, the scholastic, and the detached attitude of the Italian humanist was only one step in advance of that of the Latin Averrhoïst. Neither the wandering sectaries, in part suggesting, in part merely articulating, an antisacerdotal sentiment, nor the philosophers with their speculations concerning universals and the ultimate cause of being, were without influence in bringing about the collapse of the mediæval structure.