Romans 14: Jews and gentiles in the church of Rome

Christian Jews in Rome avoided certain foods and considered certain days as sacred (Shabbath). Gentile gentiles thought differently: foods and days are not important, faith in Jesus is important. Jews saw the gentiles as free from scruples while gentiles saw Jews as over-scrupulous.
The church must have the same thought in what is essential (Jesus is the Messiah, Son of God); each member is free on what is not essential (food and days), however one must love each other. It means that a gentile should not eat certain foods in the presence of his Jewish brother.