Schaff, Philip. History of the Christian Church (The Complete Eight Volumes in One). Amazon Kindle Edition, 2014.
Volume 2, Ante-Nicene Christianity A.D. 100-325, “Chapter 11. The Heresies of the Ante-Nicene Age” Sections 112-136, Loc. 17655-18757.
§ 122. The Nicolaitans.
Schaff classes the Nicolaitans among the various types of Gnostics. They are identified in Revelation 2:6, 15, and allegedly stem from Nicolas, found in Acts 6:5, who may “have apostatized from the true faith, and taught the dangerous principle that through sensuality the flesh must be abused” (Schaff 2014, Loc. 18165). Schaff adduces Irenaeus and Hippolytus, who comment that the Nicolaitans abused themselves by indulgence, such as adultery and eating things sacrificed to idols (Schaff 2014, Loc. 18173). Counter to this view, Clement of Alexandria says Nicolas’ statements about abusing the flesh were misunderstood by his disciples.