The Cambridge Companion to St Paul Quotes

“If Paul was not reacting to a legalistic Judaism which understood salvation to be dependent ultimately on human achievement, then what was he reacting to? Sanders himself saw Paul’s reaction to be essentially confused. But James Dunn argued that the new perspective shed light on Paul’s theology by allowing us to see that its polemical thrust was directed not against the idea of achieving God’s acceptance by the merit of personal achievement (good works), but against the Jewish intention to safeguard the privilege of covenant status from being dissipated or contaminated by non-Jews. Paul was reacting primarily against the exclusivism which he himself had previously fought to maintain. In particular, he was reacting against the conviction (shared by most other Christian Jews) that ‘works of the law’, such as (or particularly) circumcision and laws of clean and unclean, continued to prescribe the terms of covenant relationship for Gentiles as well as Jews. It was in and from this conflict that Paul’s doctrine of justification by faith alone achieved its classic expression (Gal. 2:1–21). (p.10)”
― James D.G. Dunn, The Cambridge Companion to St Paul