Black Rifles Matter
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Are you saying that when Paul used the word "Gentiles" in this verse he was referring to Jews?:
17 Indeed you are called a Jew, and rest on the law, and make your boast in God,
Me said:The audience is gentiles that were proselytes to Israel, they know of the law and they know they are required to keep it. They are called Jew as a result. And Paul is now ready to share his gospel with them.
It is what Paul said. I am sorry you don't like it, the part where people did in fact keep the law to earn life.