When it comes to having unity with one another in non-essential issues, Paul reminds us that unity does not equal uniformity. While God calls us to have the same spirit and to accept one another, He does not require us to hold the same position on issues in which the Bible is silent.
In Romans 12 the apostle Paul teaches that in view of God’s gracious and merciful work of redemption in Christ, we are to be living sacrifices. He goes on in the rest of the chapter to explain what that looks like in everyday living, and what it means to be a transformed Christian. One of the implications he focuses on is how believers are to treat one another. For Paul this includes being devoted to one another, honoring one another, and living in harmony with one another.