The following is an extract from Thomas C. Oden's article "Can we talk about heresy?" in the April 1995 edition of the Christian Century. Three comments by way of introduction.
1. Oden's critique accords with the obervation that heresies are alien worldviews dressing themselves up in Christian language (see previous posts on "The Invasion of the Body Snatchers").
2. In the second paragraph, Oden has a remark about Christians being intentionally responsible for the disappearance of the concept of heresy. But doing that surely exposes that such people were Christians in name only. When the concept of heresy left it took the truth with it.