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However, the NPP exhibits not only strengths but also drawbacks, similar to those identified in
Chapter 3 on social studies on Paul and his tent-making. The NPP adopting the similar research
method may also have similar weaknesses.
Firstly, the NPP in terms of social studies has a reductionistic character, although Dunn (2013:157)
says that this should be avoided. Specifically, it seems reasonable exegetically that Paul’s use of
the term “justification by faith” could be understood in the relationship between Jews and Gentiles
(Rom. 1:16, 2: 9, 10; 2:25-29; 3:29; 4:9-12; Gal. 2:11-16) (Arnold, 2015:13, 14). However, Paul
did not use the term exclusively for the social problem (Kim, 2002:54; Westerholm, 2006). The
advocates of the NPP also agree on this (Dunn, 1998:372, 378, 379; Longenecker, 1998:180,
181). In other words, the interpretation focussing on the social relations of Jews and Gentiles
cannot cover all the texts regarding justification by faith in all the Pauline letters since the doctrine
has a soteriological understanding beyond the social perspective38. The Jewish law also appears
as a symbol of Israel’s status, but it also has a characteristic of universal ethics (Longenecker,
1990:180), which means that “works of the law” are not confined to the rules forming the ethnic
boundaries (Waldschmidt, 2016:12). Therefore, it is better to see that the argument of the NPP
might be a form of social application of Paul’s justification by faith to solve the problematic
relationship between the Jews and Gentiles.
Secondly, there is one more reductionistic characteristic of the NPP: it might be limited by the
understanding of the Second-Temple Judaism. NPP research has been based on data
concerning Judaism. However, it cannot be said for certain that the Jewish literature and Paul’s
letters provide enough understanding of Judaism at the time. It is also impossible to know what
the Jewish texts that Paul adopted regarding Judaism were. Indeed, the Jewish literature at that
time contains not only the Jewish understanding of the NPP, but also other understandings
(Carson, 2001:543, 545; Thomas, 2018:25), including “[…] statements of synergism in Second-
Temple Jewish literature” (Waldschmidt, 2016:5).
38 Dunn (2008:379) thinks that Galatians 2:11, 14 is linked to 2:15, 16. In other words, the justification by
faith in Galatians 2:16 claims to be understood as a term based on the relationship between Jews and
Gentiles. Considering the context, Dunn’s argument appears to be correct, but Dunn might not
consider the latter half of Galatians 2:16 citing Psalm 143:2, a representative text indicating the
universal corruption of man. The law exposes sin of all people including the Jews. No people could
satisfiy the law entirely so that they all are sinners. According to Horton (2007:73), if Paul’s justification
by faith indicated only membership identity, “Paul would have had every opportunity to clear up the
misunderstanding by narrowing his polemics to membership identity, but instead he simply elaborates
his broader thesis”. While the context of Romans 3:20 deals with the critique of “Jewish restrictiveness”
(Dunn, 2008:372), Smith (1999:106) notes that Romans 3:20 deals with the problem of human
fundamental disobedience to God. As Romans 3:20 cites Psalm 143:2 like Galatians 2:16, Dunn's
interpretation might be contextually correct, but it seems to overlook the implication of the Old
Testament quotation.