"Numenius". Stanford Encyclopedia of Philosophy. 2016.
George Karamanolis (2013). "Numenius". Stanford Encyclopedia of Philosophy.
unl.edu
Professor John D Turner considers Plotinus, Porphyry, and Amelius all to be Neoplatonic philosophers who were critical of Gnosticism. Professor TurnerArchived 2014-08-16 at the Wayback Machine is quoted "In the late third century, Sethianism also became estranged from orthodox (Neo)Platonism under the impetus of attacks and refutations from the circle of Plotinus and other Neoplatonists which were just as effective as those of the Christian heresiologists. At this time, whatever Sethianism was left became increasingly fragmented into various derivative and other sectarian gnostic groups such as the Archontics, Audians, Borborites, Phibionites and others, some of which survived into the Middle Ages."
web.archive.org
Professor John D Turner considers Plotinus, Porphyry, and Amelius all to be Neoplatonic philosophers who were critical of Gnosticism. Professor TurnerArchived 2014-08-16 at the Wayback Machine is quoted "In the late third century, Sethianism also became estranged from orthodox (Neo)Platonism under the impetus of attacks and refutations from the circle of Plotinus and other Neoplatonists which were just as effective as those of the Christian heresiologists. At this time, whatever Sethianism was left became increasingly fragmented into various derivative and other sectarian gnostic groups such as the Archontics, Audians, Borborites, Phibionites and others, some of which survived into the Middle Ages."