Authorship of Pauline epistles revisited

The name Paul appears in 13 epistles, but is he the real author? According to different biblical scholars, the number of letters really attributed to Paul varies from 4 to 13, with a majority agreeing on seven. This article proposes to revisit this authorship attribution problem by considering two effective methods (Burrows' Delta, Labbé's intertextual distance). Based on these results, a hierarchical clustering is then applied showing that four clusters can be derived, namely: { Colossians ‐ Ephesians }, {1 and 2 Thessalonians }, { Titus , 1 and 2 Timothy }, and { Romans , Galatians , 1 and 2 Corinthians }. Moreover, a verification method based on the impostors' strategy indicates clearly that the group { Colossians ‐ Ephesians } is written by the same author who seems not to be Paul. The same conclusion can be found for the cluster { Titus , 1 and 2 Timothy }. The Letter to Philemon stays as a singleton, without any close stylistic relationship with the other epistles. Finally, a group of four letters { Romans , Galatians , 1 and 2 Corinthians } is certainly written by the same author (Paul), but the verification protocol also indicates that 2 Corinthians is related to 1 Thessalonians, rendering a clear and simple interpretation difficult.