Four theological truths . . . undergird Paul’s admonition to welcome the weak, and neither despise nor condemn them. They concern God, Christ, them and ourselves. First, God has accepted them (3). Secondly, Christ died and rose to be the Lord, both theirs and ours (9). Thirdly, they are our sisters and brothers, so that we are members of the same family (10a). Fourthly, all of us will stand before God’s judgment seat (10b). Any one of these truths should be enough to sanctify our relationships; the four together leave us without excuse.
Stott, John. The Message of Romans: God’s Good News for the World (The Bible Speaks Today Series) (pp. 363-364). InterVarsity Press. Kindle Edition.