Mark Dever writing for the 9marks ejournal has written a great article titled 'Together for what?' His main points are;
1 Do we follow commands to purify or to unite?
2 What are some common fights Christians have?
3 What’s the specific purpose for cooperating?
4 What must Christians agree upon? (Essentials)
5 What may Christians disagree about? (Non-essentials)
6 How can Christians disagree well?
This is quite a long read, and to be honest I think I'll need to read it a few more times to take much of it in, but Dever as usual is highly worth paying some attention to.
Read the whole article here
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Also, here's the table of contents for the whole 9marks ejournal
CHRISTIAN COOPERATION
Fellow Workers for the TruthBy Andy Johnson
Together for What?By Mark Dever
A Senior Saint on UnityBy Iain Murray
Theological TriageBy R. Albert Mohler
CHRISTIAN SEPARATION
When, Why & Where To Draw BoundariesBy Wayne Grudem
A Pastors' and Theologians' Forum on Fundamentalism
Potential and Pitfalls of Together For The GospelBy David Doran
A Christian Fundamentalist Travel GuideBy Matthew C. Hoskinson
An Evangelical-Fundamentalist Convergence?By Ben Wright
BOOK & VIDEO REVIEWS
Video Review: NOOMABy Rob Bell Reviewed by Greg Gilbert
Book Review: Promise UnfulfilledBy Roland McCune Reviewed by Andy Naselli
Book Review: Why We're Not EmergentBy Kevin DeYoung & Ted Kluck Reviewed by Jonathan Leeman
Book Review: I Sold My Soul On eBayBy Hemant Mehta Reviewed by Michael McKinley