2. Error, indeed, is never set forth in its naked deformity, lest, being thus exposed, it should at once be detected. But it is craftily decked out in an attractive dress, so as, by its outward form, to make it appear to the inexperienced (ridiculous as the expression may seem) more true than the truth itself. One far superior to me has well said, in reference to this point, “A clever imitation in glass casts contempt, as it were, on that precious jewel the emerald (which is most highly esteemed by some), unless it come under the eye of one able to test and expose the counterfeit. Or, again, what inexperienced person can with ease detect the presence of brass when it has been mixed up with silver?” Lest, therefore, through my neglect, some should be carried off, even as sheep are by wolves, while they perceive not the true character of these men,—because they outwardly are covered with sheep’s clothing (against whom the Lord has enjoined us to be on our guard), and because their language resembles ours, while their sentiments are very different,—I have deemed it my duty (after reading some of the Commentaries, as they call them, of the disciples of Valentinus, and after making myself acquainted with their tenets through personal intercourse with some of them) to unfold to thee, my friend, these portentous and profound mysteries, which do not fall within the range of every intellect, because all have not sufficiently purged their brains. I do this, in order that thou, obtaining an acquaintance with these things, mayest in turn explain them to all those with whom thou art connected, and exhort them to avoid such an abyss of madness and of blasphemy against Christ. I intend, then, to the best of my ability, with brevity and clearness to set forth the opinions of those who are now promulgating heresy. I refer especially to the disciples of Ptolemæus, whose school may be described as a bud from that of Valentinus. I shall also endeavour, according to my moderate ability, to furnish the means of overthrowing them, by showing how absurd and inconsistent with the truth are their statements. Not that I am practised either in composition or eloquence; but my feeling of affection prompts me to make known to thee and all thy companions those doctrines which have been kept in concealment until now, but which are at last, through the goodness of God, brought to light. “For there is nothing hidden which shall not be revealed, nor secret that shall not be made known.”