The Manichaeans taught ''[[Ontology|ontological]] dualism'': that there were two principles ''ab aeterno'', the one good, the other bad. Only the good principle is called God: the bad principle is not called God anywhere in Manichaean sources <ref>van Schaik</ref>. It is only in Augustine’s [[polemic]]al anti-Manichaean text ''Contra Faustum'', a debate between Augustine and the Manichaean Bishop Faustus, that we find the existence of two gods being discussed, among other topics. Faustus denies the possibility forthrightly <ref>''Contra Faustum'' XXXI.1</ref>: the bad principle is a ''pars Dei'' <ref>"pars Dei"—Latin. a part, or portion, of God</ref> which mixes itself with the creation, while the [[substance]] of God remains unaffected. | The Manichaeans taught ''[[Ontology|ontological]] dualism'': that there were two principles ''ab aeterno'', the one good, the other bad. Only the good principle is called God: the bad principle is not called God anywhere in Manichaean sources <ref>van Schaik</ref>. It is only in Augustine’s [[polemic]]al anti-Manichaean text ''Contra Faustum'', a debate between Augustine and the Manichaean Bishop Faustus, that we find the existence of two gods being discussed, among other topics. Faustus denies the possibility forthrightly <ref>''Contra Faustum'' XXXI.1</ref>: the bad principle is a ''pars Dei'' <ref>"pars Dei"—Latin. a part, or portion, of God</ref> which mixes itself with the creation, while the [[substance]] of God remains unaffected. |