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(bärdəsā`nēz), 154?–222?, Christian philosopher and poet of Syria, missionary among the Armenians. Conflicting traditions report him both as defender of the faith against various Gnostic sects and as a heretic and founder of Bardesanism.
When 'Ammar says that "reasoned opinion may devise Good and Evil on the basis of what people observe of good and evil in the world," he means that reasoned opinion may devise the concept of Good and Evil principles or deities; in other words, it is not surprising that rational people should come up with dualistic religions--and, in a parallel passage in his other book, he mentions the teachings of Zoroaster, Mani, Bardaisan, and Marcion.
Lost Christianities should at least have mentioned in passing the encratite features of Tatian's Gospel harmony (the Diatessaron), the strange faith of Bardaisan and his disciples, and in the fourth century the elitist views of the Liber Graduum and the struggles in Aphrahat and Ephrem for orthodoxy.