Making the letter more personal so as to ease its awkwardness, he greets his friends Prisca and Aquila who he met earlier and now had returned to Rome, as well as Andronicus and Junia. .
Paul knows what's happening in Rome. It can be said that he knows because of the statements he makes throughout the letter. Realizing that the Jews and Gentiles are at odds due to their different takes on justification due to law or faith as well as problems with each other's practices, Paul speaks to them and advises them.
The Gentiles in Rome question the practices of the Jewish Christians because of their eating practices. To the Gentiles, the constant relying on the Jewish law and not faith is a serious problem. It should be faith they say, that allows one to be Christian, not the law. The Jewish Christians are keeping the Sabbath and keeping themselves pure by not eating meat, and this angers the Gentiles. Paul attacks both sides of the situation so as to not give one side of the argument an unfair advantage. "So do not let your good be reviled," he says, "For the kingdom of God is not a matter of food and drink, but of righteousness, peace, and joy in the holy Spirit; whoever sees Christ in this way is pleasing to God and approved by others (14:16-18)." He goes on to tell the Jews not to make the Gentiles follow the Jewish laws about food, and the Gentiles to not become a "stumbling block" for the Jews by eating things that they don't eat in front of them. .
Though this is an important part of Paul's address to the Romans, the more important issue that Paul takes notice of that may later cause the splitting into factions is justification. As was mentioned earlier, the Jewish Christians in Rome don't believe in the following of Jewish law but rather faith instead, and the Jews believe in the law. To combat this issue, Paul again attacks both sides of the issue before giving insight into the possible remedies.