The most notable feature of these practical instructions is that Paul grounds them on his Christology and, in particular, on the death, resurrection, and parousia of Jesus. The weak are brothers and sisters for whom Christ died. Christ rose to be their Lord, and we have no right to interfere with His servants. He is also coming to be our judge, so we should not play the role of judge ourselves. We should also follow the example of Christ, who did not please Himself but became a servant – indeed, a servant of both Jews and Gentiles. So Paul leaves his readers with a beautiful vision of the weak and the strong, Jewish believers and Gentile believers, who are bound together by such a “spirit of unity” that, “with one heart and mouth,” they glorify God together (15.5-6).
From: The Message of Romans: God’s Good News for the World by John R. W. Stott; The Bible Speaks Today series (Downers Grove: InterVarsity Press, 1994), p. 43.