Paul calls those who have been received by Christ to receive others who have also been received by Christ.  It's what brothers and sisters do as members in the family of God.

Paul desired harmony within the church because God desires harmony within the church in order that His people can and will ascribe Him glory and praise in unison.  

Paul reminds the strong in faith that "Christ has already paid the supreme price for the weak Christian, so how can the strong in faith refuse to pay the quite insignificant price of a minor and occasional restriction in their diet?" (Moo)

How do those weak in faith and those strong and faith live in unity in the church despite differing opinions on matters of Christian liberty? By looking to Christ, our stronger older brother, Who is able to make us stand because He died and rose again.

Paul continues to describe the life of those whose minds are being transformed by explaining how we are to related to everyone around us, Christian and non-Christian alike.  He says we are to walk lovingly, urgently, and properly.

Paul explains how we are to live in relation to the state and the governing authorities of the civil magistrate.

The renewal of our minds changes how we relate to those within the community of faith and outside the community of faith, and Christ provides both the power and motivation to do so.

We don't live the Christian life in isolation.  Every Christian has something to contribute to and we all benefit from one another.

Paul makes an appeal to the church at Rome and to us to shift from contemplating the realities of the gospel to living in light of them.

Paul spontaneously broke into praise and worship because he rightly believed God alone was and is deserving of glory and he therefore couldn’t do otherwise.