Our ancestors used holy stories as fluid, continually changing and growing with each generation.  The story of Noah is a great example of this.  The story of Noah was written in the Torah around 900 BCE, but there are stories of the great flood that mirror this one that are even more ancient.  Paul seems to understand that the gospel has to be fluid like this.  Be a Jew to Jews, under the law/outside the law to those in each camp, etc.  What would it look like if we allowed the gospel to be as fluid as our ancestors did?