And I may tell you from my experience, that not many take from Egypt only the useful, and go away and use it for the service of God; while Ader the Idumæan has many brethren. These are they who, from their Greek studies, produce heretical notions, and set them up, like the golden calf, in Bethel, which signifies God’s house. In these words also there seems to me an indication that they have set up their own imaginations in the Scriptures, where the word of God dwells, which is called in a figure Bethel. The other figure, the word says, was set up in Dan. Now the borders of Dan are the most extreme, and nearest the borders of the Gentiles, as is clear from what is written in Joshua, the son of Nun. Now some of the devices of these brethren of Ader, as we call them, are also very near the borders of the Gentiles. Letter of Origen to St. Gregory Thaumaturgus.