He records that it was in the
reign of Valens and Valentinian that Philostorgius lived; he was supreme among
the physicians, and his sons were Philagrius and Posidonius. He says he saw
Posidonius, who was outstanding in the field of medicine. He adds, though, that
he was unsound in maintaining that it is not demonic attack that makes people
mad but that their disease is due to an unhealthy mixture of certain humors.
For the power of demons, he said, in no way threatens human beings.
(Philostorgius, Church History [trans. Philip R. Amidon; Writings From
the Greco-Roman World 23; Atlanta, Ga.: Society of Biblical Literature, 2007],
Book 8, no. 10 [pp. 117-18])
