AC believed that, “There is an elaborate cryptographic meaning in this verse.” He keyed it to the words folly, naught, it, and me, and said it required further research. I am sure I do not have it decoded. However, there are fragments that disclose themselves upon inspection. “thou meanest naught” may be read, “thou teachest Nuit,” or the mystery of Zero, which “thou shalt reveal,” i.e., manifest (Cap. I, vv. 1, 5). There is also the strange use of “avail.” As in Cap. I, v. 23, this seems always to have been superficially read as “prevail.” However, there simply is no English language validity to that rendering. As an intransitive verb it means, “to be of use, value, or advantage; to serve.” The literal meaning here is thus that, “they who cry aloud their folly that thou meanest nought” shall be neither of value nor service; but the Beast shall serve, shall be of value.
“They are not of me” could be read, “They are Naught of Naught” (Greek MH = “naught”).