I thought it migh be interesting for readers who like on occasion to get down into the weeds of scholarship to see a more detailed argument for how the *similarity* of 2 Thessalonians to 1 Thessalonians suggests not that Paul wrote both of them but that a later author (of 2 Thessalonians) was imitating Paul’s authentic letter (1 Thessalonians).  Here’s how I express the case in my book Forgery and Counterforgery (Oxford University Press).  [Don’t worry about the Greek: you can either just see the similar letters or look up the verses in your English translation]:

 

2 Thessalonians as a Forgery

One reason the case for the inauthenticity of 2 Thessalonians has occasionally seemed wanting, even to some very fine scholars, is that critics have often resorted to a shotgun approach, citing every possible argument, good or bad, in support of their position.   It is all too easy to dismiss bad arguments, leaving an appearance of evidence in balance, pro and con.  And so, for example, the letter is often said to lack Paul’s customary “warmth” (are all of Paul’s writings necessarily warm?  Even to the same congregation?  Think of the different fragments of correspondence with the Corinthians – including 2 Corinthians 10-13); the focus is on Christ as Kurios rather than on his cross (does Paul have to focus on the cross, in everything he says?); the letter does not employ the diatribe style (as if Paul was obliged to do so?); the letter is lacking in justification language (do we need to read every Pauline letter with Lutheran blinders?).  A scholar like Malherbe can easily dismiss such claims, making the other arguments seem weak by association.

A better tack is

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