Dave Doran recalls six books or articles by evangelicals “about the need to formulate doctrinal boundaries” and “the question of separation”:

1. Carson, D. A. Love in Hard Places. Wheaton: Crossway, 2002.

2. Mohler Jr., R. Albert. “Reformist Evangelicalism: A Center without a Circumference.” Page 131–50 in A Confessing Theology for Postmodern Times. Edited by Michael S. Horton. Wheaton: Crossway, 2000.

3. Grudem, Wayne. “Why, When, and for What Should We Draw New Boundaries?” Page 339–70 in Beyond the Bounds: Open Theism and the Undermining of Biblical Christianity. Edited by John Piper and Justin Taylor. Wheaton: Crossway, 2003.

4. MacArthur, John F. Reckless Faith: When the Church Loses Its Will to Discern. Wheaton: Crossway, 1994.

5. Sproul, R. C. Getting the Gospel Right: The Tie That Binds Evangelicals Together. Grand Rapids: Baker, 1999.

6. Erickson, Millard J., Paul Kjoss Helseth, and Justin Taylor, eds. Reclaiming the Center: Confronting Evangelical Accommodation in Postmodern Times. Wheaton: Crossway, 2004.

“You can’t mark a boundary line without making distinctions and establishing differences.”