But since this tradition is not published alone for him who perceives the magnificence of the word; it is requisite, therefore, to hide in a mystery the wisdom spoken, which the Son of God taught. Now, therefore, Isaiah the prophet has his tongue purified by fire, so that he may be able to tell the vision. And we must purify not the tongue alone, but also the ears, if we attempt to be partakers of the truth. Such were the impediments in the way of my writing. And even now I fear, as it is said, “to cast the pearls before swine, lest they tread them under foot, and turn and rend us.”[917] For it is difficult to exhibit the really pure and transparent words respecting the true light, to swinish and untrained hearers. For scarcely could anything which they could hear be more ludicrous than these to the multitude; nor any subjects on the other hand more admirable or more inspiring to those of noble nature. “But the natural man receiveth not the things of the Spirit of God; for they are foolishness to him.”[918] But the wise do not utter with their mouth what they reason in council. “But what ye hear in the ear,” says the Lord, “proclaim upon the houses;”[919] bidding them receive the secret traditions of the true knowledge, and expound them aloft and conspicuously; and as we have heard in the ear, so to deliver them to whom it is requisite; but not enjoining us to communicate to all without distinction, what is said to them in parables. But there is only a delineation in the memoranda, which have the truth sowed sparse and broadcast, that it may escape the notice of those who pick up seeds like jackdaws; but when they find a good husbandman, each one of them will germinate and produce corn. CHAPTER XIII. ALL SECTS OF PHILOSOPHY CONTAIN A GERM OF TRUTH. Since, therefore, truth is one (for falsehood has ten thousand by-paths); just as the Bacchantes tore asunder the limbs of Pentheus, so the sects both of barbarian and Hellenic philosophy have done with truth, and each vaunts as the whole truth the portion which has fallen to its lot. But all, in my opinion, are illuminated by the dawn of Light.[920] Let all, therefore, both Greeks and barbarians, who have aspired after the truth,--both those who possess not a little, and those who have any portion,--produce whatever they have of the word of truth.