"Heresies are not produced by ignorance but by the speculations of learned men." (Steve Addison)
This is from Steve Addison's great new study of church planting and gospel movements, "Movements that Change the World", (Missional Press, 2009).
This is a critically-important book, and should be read by all who care for the Church of Jesus Christ.
Have a look at Steve's blog-site, www.movements.net