There are so many things that we allow to separate us from our brothers and sisters in Christ, some of these things can be characterized as non-essential. In the same way, Paul addressed this issue with the early church as we read about in this scripture. James, the half-brother of Jesus requested Paul to take part in a Nazarene ceremony so that the Jews would see that he wasn't against the law and this is one of the many things Paul ended up doing to become "All things to all men". In the same way, we are encouraged today to be unified in the essential things, to have freedom in non-essentials, and to have charity in all things (paraphrasing Augustine).