Perhaps it was not so much the public accusation that Abelard denied the doctrine of the Trinity, as his assertion of the supremacy of reason--which clearly betrayed his intention of breaking the thraldom of authority--that insured his condemnation. It was impossible to restrict the rising discussions within their proper sphere, or to keep them from the perilous ground of ecclesiastical history. [Sidenote: The book "Sic et Non."] Abelard in his work entitled "Sic et Non," sets forth the contradictory opinions of the fathers, and exhibits their discord and strifes on great doctrinal points, thereby insinuating how little of unity there was in the Church. It was a work suggesting a great deal more than it actually stated, and was inevitably calculated to draw down upon its author the indignation of those whose interests it touched. [Sidenote: Scholastic philosophy, rise of.] Out of the discussions attending these events sprang the celebrated doctrines of Nominalism and Realism, though the terms themselves seem not to have been introduced till the end of the twelfth century. The Realists thought that the general types of things had a real existence; the Nominalists, that they were merely a mental abstraction expressed by a word. It was therefore the Old Greek dispute revived. [Sidenote: Nominalism and Realism.] Of the Nominalists, Roscelin of Compiègne, a little before A.D. 1100, was the first distinguished advocate; his materializing views, as might be expected, drawing upon him the reproof of the Church. In this contest, Anselm, the Archbishop of Canterbury, attempted to harmonize reason in subordination to faith, and again, by his example, demonstrated the necessity of submitting all such questions to the decision of the human intellect.