Here in Romans 12 we are in the last section of the book. When you study the book of Romans you can break the book down into four parts. 

Section 1: The Wrath of God. Chapters 1-3.

Section 2: The Grace of God. Chapters 4-8.

Section 3. The Plan of God. Chapters 9-11.

Section 4. The Will of God. Chapters 12-16. 

The apostle Paul is writing to believers here in chapter 12 instruct us in God’s will for our lives and to challenge us to genuinely love one another. 

Planting churches Paul has seen it all, he’s done it all. He’s concerned about people whose love is insincere.