Galatians 5

Some of them are turning to circumcision as means by which they are saved. Paul urges them not to turn to it, for living by circumcision requires fulfillment of the law in its entirety. Living as followers of Jesus gives no value to circumcision or uncircumcision. The only thing that matters is faith working through love.

Someone must have persuaded them away from the gospel. Paul uses this idea of a little leaven working through the whole dough in 1 Corinthians as he does here. Something small like a little persuasion can work through the entire church and infect it all. Perhaps this persuasion was against Paul, but Paul defends himself saying that he does not teach that circumcision is necessary for salvation. They're getting all worked up over this matter of circumcision and taking it too far. Paul even suggests that they take it further and emasculate themselves.

They should not fight and turn against each other. Instead, we are supposed to love one another and we shouldn't become consumed with fighting with one another. We are to walk by the spirit. Paul lists out the fruit of the Spirit, which is contrasted by the desires of the flesh. We are to live by the Spirit and not gratify the desires of the flesh.