Shared ground

Paul is speaking as part of a Jewish “we” and uses that shared identity as the starting point (v.15). His main claim is explicit and repeated: people are not put right with God by “works of the law,” but through Christ-related faith (v.16). He reinforces this by saying “even we believed in Christ Jesus,” meaning Jewish believers themselves did not treat law-keeping as the basis for being put right (v.16).

A second explicit point is the universal reach of his conclusion: “no flesh” (no human being) will be put right by works of the law (v.16). This matches the Antioch context in which table separation implied that law-observance and Jewish identity determined full standing.

Where interpretation differs

Two questions affect how people explain Paul’s claim.

First, the phrase “the faith of Jesus Christ” can be read as (a) faith in Jesus (human trusting/allegiance directed to him) or (b) Jesus’ faithfulness (his loyal obedience as the decisive factor), with believers’ faith as the means of sharing in that outcome. Either way, the text’s contrast remains: “works of the law” are not the basis for being put right.

Second, “works of the law” can be heard mainly as (a) the whole project of keeping the law to secure right standing, or more specifically as (b) law practices that marked Jewish identity (especially those that shaped shared meals and social boundaries), or (c) both at once. The immediate story (Peter withdrawing from meals) pushes readers to include boundary-setting practices, but Paul’s “no flesh” conclusion pushes readers toward a broader claim.

Why the disagreement exists Paul uses compact, repeated phrases that summarize a larger argument he will expand later. That compression leaves room for different explanations of (1) what “faith of Jesus Christ” grammatically highlights, and (2) whether “works of the law” names a narrow set of identity practices or the broader attempt to be accepted by doing what the law requires.

What this passage clearly contributes

• Explicitly: being put right is not grounded in “works of the law,” and it is tied to Christ-related faith; Paul repeats the point three times for emphasis (v.16).
• Explicitly: the claim is not only about Gentiles; “even we” (Jews) respond by believing in Christ for this purpose (v.16).
• Explicitly: “no flesh” universalizes the inability of law-works to achieve this outcome for anyone (v.16).
• Inference anchored in context: because the statement is placed inside the Antioch dispute, Paul’s principle addresses social separation and belonging as well as how someone is accepted before God (2:11–14; echoed by the later summary in Galatians 2:21).