Great find. I obviously need to try and get my hands on Obbink's translation of On Piety again. I think your suggestion of this being a reaction to the Greeks' contact with other peoples' religions makes sense, although they would have been aware of the Egyptians and others since the time of Herodotus. For additional context of that excerpt from Philodemus: https://papyri.info/dclp/62400…lume+asc,item+asc&p=0&t=3 Column 23 P.Herc. 1077 col. 15 Engraved 1817-1822 by Giovanni Battista Casanova [ ̣…