I was directed to an interesting piece on First Things from 2007 by Richard Neuhaus, in which he coins the axion: “Where orthodoxy is optional, orthodoxy will sooner or later be proscribed.” A provocative proposition – have a look at the argument and see what you think.
Incidentally the theme relates vaguely to a good book challenging the popular idea that the early Church had no orthodoxy – the familiar Dan Brown idea that there was a pot pourri of beliefs until nasty Constantine (or some other spoil-sport) forced everyone into line. It’s The Heresy of Orthodoxy by Kostenberger & Kruger.