... The lack of consensus regarding a date and destination ... reflects a dilemma for this position: on the one hand, the date needs to be early enough for the letter to have been accepted as Pauline ... [on] the other hand, the date and destination need to be such that the author could be confident that no contemporary of 1 Thessalonians ... could have exposed 2 Thessalonians as a ... forgery." However, 2 Thessalonians 2:2 seems to warn its readers against accepting teachings from a letter forged in Paul's name, indicating that either a pseudonymous author was attempting to disarm the letter's audience into accepting his forgery as authentically Pauline, or that Paul himself was writing to warn his readers that forged letters were being circulated in his name; if the latter is the case, which it must be for Nicholls to claim authenticity, then forged Pauline letters existed while Paul was still alive and, therefore, would have been contemporaneous with 1 Thessalonians. Pastoral epistles The First Epistle to Timothy, the Second Epistle to Timothy, and the Epistle to Titus are often referred to as the Pastoral Epistles and are the most disputed of all the epistles ascribed to Paul. Despite this, these epistles were accepted as genuine by many, perhaps most of the ante-Nicene Church Fathers. Some scholars have argued that the letters were certainly accepted as Pauline by the time of Irenaeus. They were also included in the Muratorian fragment. According to Jerome, the gnostic Christian Basilides also rejected these epistles, and Tatian, while accepting Titus, rejected other Pauline epistles. Marcion (c. 140) excluded all three, along with Hebrews, from his otherwise complete Pauline corpus, and it is impossible to determine whether or not he knew of them. Donald Guthrie, for instance, argues that Marcion's theology would have been cause to reject the letters since it was incompatible with certain passages, such as 1 Tim 1:8 and 1 Tim 6:20, while Ehrman suggests that 2nd-century proto-orthodox Christians had motivation to forge the Pastorals to combat the Gnostic use of other Pauline epistles. Even the ancient writer Tertullian (c. 220), in Adv. Marc. V.21, expresses confusion as to why these epistles had not been included in Marcion's canon. Modern scholars postulate that the Pauline Epistles originally circulated in three forms, for example, from The Canon Debate, attributed to Harry Y. Gamble: "Marcion's collection that begins with Galatians and