III.--At the outset we must note in reference to this third question, that the truth of the first question had to be made manifest rather to remove ignorance than to end a dispute. In the second question we sought equally to remove ignorance and to end a dispute. For there are many things of which we are ignorant, but concerning which we do not quarrel. In geometry we know not how to square the circle, but we do not quarrel on that point. The theologian does not know the number of the angels, but he does not quarrel about the number. The Egyptian is ignorant of the political system of the Scythians, but he does not therefore quarrel concerning it.[280] But the truth in this third question provokes so much quarrelling that, whereas in other matters ignorance is commonly the cause of quarrelling, here quarrelling is the cause of ignorance. For this always happens where men are hurried by their wishes past what they see by their reason; in this evil bias they lay aside the light of reason, and being dragged on blindly by their desires, they obstinately deny that they are blind. And, therefore, it often follows not only that falsehood has its own inheritance, but that many men issue forth from their own bounds and stray through the foreign camp, where they understand nothing, and no man understands them; and so they provoke some to anger, and some to scorn, and not a few to laughter. [Footnote 280: "_Scytharum Civilitatem._" Cf. Arist. _Ethics_, iii. 5, where [Greek: to bouleuton] is discussed, and thence come the first and the third example, a little altered, the Egyptian being substituted for the Spartan.] Now three classes of men chiefly strive against the truth which we are trying to prove. First, the Chief Pontiff, Vicar of our Lord Jesus Christ and the successor of Peter, to whom we owe, not indeed all that we owe to Christ, but all that we owe to Peter, contradicts this truth, urged it may be by zeal for the keys; and also other pastors of the Christian sheepfolds, and others whom I believe to be only led by zeal for our mother, the Church. These all, perchance from zeal and not from pride, withstand the truth which I am about to prove. But there are certain others in whom obstinate greed has extinguished the light of reason, who are of their father the devil, and yet pretend to be sons of the Church. They not only stir up quarrels in this question, but they hate the name of the most sacred office of Prince, and would shamelessly deny the principles which we have laid down for this and the previous questions.