(4) But as we say that a man can be a believer without learning, so also we assert that it is impossible for a man without learning to comprehend the things which are declared in the faith. But to adopt what is well said, and not to adopt the reverse, is caused not simply by faith, but by faith combined with knowledge. But if ignorance is want of training and of instruction, then teaching produces knowledge of divine and human things. But just as it is possible to live rightly in penury of this world's good things, so also in abundance. And we avow, that at once with more ease and more speed will one attain to virtue through previous training. But it is not such as to be unattainable without it; but it is attainable only when they have learned, and have had their senses exercised. "For hatred," says Solomon, "raises strife, but instruction guardeth the ways of life;" in such a way that we are not deceived nor deluded by those who are practised in base arts for the injury of those who hear. "But instruction wanders reproachless," it is said. We must be conversant with the art of reasoning, for the purpose of confuting the deceitful opinions of the sophists. Well and felicitously, therefore, does Anaxarchus write in his book respecting "kingly rule:" "Erudition benefits greatly and hurts greatly him who possesses it; it helps him who is worthy, and injures him who utters readily every word, and before the whole people. It is necessary to know the measure of time. For this is the end of wisdom. And those who sing at the doors, even if they sing skilfully, are not reckoned wise, but have the reputation of folly."