The struggle in Paul’s day was how the Jews and Gentiles could be one in Jesus. Some people had views about honoring the Law as a Jew and there was division about that. Today we should seek to lay aside denominational and doctrinal issues by focusing on the Word of God. Many learn doctrine from denomination that is slanted and can create division. It is through observing the whole counsel of God’s Word that we can be more one which was Paul and Jesus’ desire. See John 17.