In search of a missing link: The Bogomils and Zoroastrianism
Both Zoroastrianism and Manichaeism are dualist relig- ions. Implicit in the beliefs held true by these religions is the notion of co-equal and co-eternal principles. Implicit in this notion is the belief that both good and evil exist and are acted upon from the very beginning.
Retroactive Heresy: The influence of early Christian heresies on the identification and reaction to heretical sects
The medieval Church viewed itself as Defender of the Faith, the destroyer of the unbelievers, the wrong believers. These heretics were to be reviled and feared as perverters of God’s word. The perverters of orthodoxy were, ultimately, not to be distinguished from one another, but rather known by catchphrases.