4. John 17:21 (page 825) I pray that they will all be one, just as you and I are one—as you are in me, Father, and I am in you. And may they be in us so that the world will believe you sent me.

5. Acts 15:36-40 (page 844) After some time Paul said to Barnabas, “Let’s go back and visit each city where we previously preached the word of the Lord, to see how the new believers are doing.” 37 Barnabas agreed and wanted to take along John Mark. 38 But Paul disagreed strongly, since John Mark had deserted them in Pamphylia and had not continued with them in their work. 39 Their disagreement was so sharp that they separated. Barnabas took John Mark with him and sailed for Cyprus. 40 Paul chose Silas, and as he left, the believers entrusted him to the Lord’s gracious care.

6. Romans 12:18 (page 866)
Do all that you can to live in peace with everyone.

7. Psalm 34:14 (page 428)
Turn away from evil and do good. Search for peace, and work to maintain it.

8. 1 Corinthians 1:10 (page 870) I appeal to you, dear brothers and sisters, by the authority of our Lord Jesus Christ, to live in harmony with each other. Let there be no divisions in the church. Rather, be of one mind, united in thought and purpose.

9. Is the person trying to act in a godly-Christ centered way?
Keep the cross at the center of your theological system and motive.
Ask yourself some uncomfortable questions.
Remember that you probably held the other position not long ago.
Pursue humility with the same passion that you pursue clarity.