In our reading for today Paul finally makes it to Jerusalem. When he meets with James and the other leaders of the church there they discuss the rumor among Jewish Christians that Paul rejects the law. Paul does often talk about how the law isn't the source of salvation, but he doesn't reject the law for Jews, only for gentile Christians. So the leaders plan to have Paul publicly observe a Jewish vow of piety to show that he hasn't turned away from the law. We'll see how the plan plays out.
In the church today we have some similar challenges. We need to be open to change to engage the world in new ways. At the same time we need to respect the traditions of the church and those who have been faithful to God through the church in the past.