The date of the rise of Gnosticism cannot be fixed. Indeed, all the requisite conditions existed from the beginning. It was the “acute Verweltlichung” (as Harnack calls it) of Christianity, the development of it in connection with the various ethnic philosophies, and it began as soon as Christianity came in contact with the Greek mind. At first it was not heretical, simply because there were no standards by which to try it. There was only the preaching of the Christians; the canon was not yet formed; episcopacy was not yet established; both arose as safeguards against heresy. It was in the time of Hadrian, perhaps, that these speculations began to be regarded as heresies, because they contradicted certain fundamental truths to which the Christians felt that they must cling, such as the unity of God, his graciousness, his goodness, etc.; and therefore the Christians dated Gnosticism from that time. Gnosticism was ostensibly conquered, but victory was achieved only as the Church itself became in a certain sense Gnostic. It followed the course of Gnosticism a century later; that is, it wrote commentaries, systems of doctrine, &c., philosophizing about religious things (cf. Harnack’s Dogmengeschichte, I. p. 162 sq.). It must be remembered in reading the Fathers’ accounts of Gnosticism that they took minor and unimportant details and magnified them, and treated them as the essentials of the system or systems. In this way far greater variety appears to have existed in Gnosticism than was the case. The essential principles were largely the same throughout; the differences were chiefly in regard to details. It is this conduct on the part of the Fathers that gives us such a distorted and often ridiculous view of Gnosticism. The Carpocratians are the first of whom Irenæus expressly says that they called themselves Gnostics (adv. Hær. I. 25, 6), while Hippolytus first speaks of the name as adopted by the Naasseni (V. 1). The Carpocratians are mentioned by Hegesippus (quoted below in chap. 22). The system was more exclusively Greek in its character than any other of the Gnostic systems. The immorality of the sect was proverbial; Tertullian (de Anima, c. 35) calls Carpocrates a magician and a fornicator. He taught the superiority of man over the powers of the world, the moral indifference of things in themselves, and hence, whether he himself was immoral or not, his followers carried out his principles to the extreme, and believed that the true Gnostic might and even must have experience of everything, and therefore should practice all sorts of immoralities. Eusebius is probably right in assigning Carpocrates to this period. The relation of his system to those of Saturninus and Basilides seems to imply that he followed them, but at no great interval. Other sources for a knowledge of Carpocrates and his sect are Irenæus (I. 25 and II. 31–33), Clement of Alexandria (Strom. III. 2), Hippolytus (Phil. VII. 20), Tertullian (de Anima, 23, 35), Pseudo-Tertullian (adv. omnes Hær. 3), Epiphanius (Hær. 27), and Philaster (c. 35). Of these only Irenæus, Clement of Alexandria, and the earlier treatise of Hippolytus (which lies at the base of Pseudo-Tertullian and Philaster) are independent; and probably, back of Irenæus, lies Justin Martyr’s lost Syntagma; though it is very likely that Irenæus knew the sect personally, and made additions of his own. Compare Harnack’s Quellenkritik des Gnosticismus, p. 41 sq.