But when I saw that they walked not uprightly unto the truth of the gospel, I said to Cephas before them all: If thou, being a Jew, livest after the manner of the Gentiles and not as the Jews do, how dost thou compel the Gentiles to live as do the Jews?
Galatians 2:12 For before that some came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them who were of the circumcision.
Galatians 2:13 And to his dissimulation the rest of the Jews consented: so that Barnabas also was led by them into that dissimulation.
Galatians 2:14 But when I saw that they walked not uprightly unto the truth of the gospel, I said to Cephas before them all: If thou, being a Jew, livest after the manner of the Gentiles and not as the Jews do, how dost thou compel the Gentiles to live as do the Jews?
Galatians 2:15 We by nature are Jews: and not of the Gentiles, sinners.
Galatians 2:16 But knowing that man is not justified by the works of the law, but by the faith of Jesus Christ, we also believe in Christ Jesus, that we may be justified by the faith of Christ and not by the works of the law: because by the works of the law no flesh shall be justified.
The verse centers on "walked", "uprightly", "truth", "gospel", "said", "cephas", "before", and "thou". It is saying that the verse draws attention to "walked" and "uprightly", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 13's "And to his dissimulation the rest of..." into verse 15's "We by nature are Jews and not...", so "walked" and "uprightly" belong inside that flow. In Galatians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "walked" and "uprightly" with trust shaped by these words, not by a vague optimism outside the passage.