This volume gives a fair sample of Augustin’s controversial powers. His nine years’ personal experience of the vanity of Manichæism made him thoroughly earnest and sympathetic in his efforts to disentangle other men from its snares, and also equipped him with the knowledge requisite for this task. No doubt the Pelagian controversy was more congenial to his mind. His logical acuteness and knowledge of Scripture availed him more in combating men who fought with the same weapons, than in dealing with a system which threw around its positions the mist of Gnostic speculation, or veiled its doctrine under a grotesque mythology, or based itself on a cosmogony too fantastic for a Western mind to tolerate.[25] But however Augustin may have misconceived the strange forms in which this system was presented, there is no doubt that he comprehended and demolished its fundamental principles;[26] that he did so as a necessary part of his own personal search for the truth; and that in doing so he gained possession, vitally and permanently of ideas and principles which subsequently entered into all he thought and wrote. In finding his way through the mazes of the obscure region into which Mani had led him, he once for all ascertained the true relation subsisting between God and His creatures, formed his opinion regarding the respective provinces of reason and faith, and the connection of the Old and New Testaments, and found the root of all evil in the created will.