This is the negative Trinity; its three statements are, in an ultimate sense, identical. They harmonise Being, Becoming, Not-Being, the three possible modes of conceiving the universe.
The statement, Nothing is Not, technically equivalent to Something Is, is fully explained in the essay called Berashith.
The rest of the chapter follows the Sephirotic system of the Qabalah, and constitutes a sort of quintessential comment upon that system.
Those familiar with that system will recognise Kether, Chokmah, Binah, in the First Triad; Daath, in the Abyss; Chesed, Geburah, Tiphareth, in the Second Triad; Netzach, Hod and Yesod in the Third Triad, and Malkuth in the Tenth Emanation.
It will be noticed that this cosmogony is very complete; the manifestation even of God does not appear until Tiphareth; and the universe itself not until Malkuth.
The chapter may therefore be considered as the most complete treatise on existence ever written.
[2] The Unbroken, absorbing all, is called Darkness.
COMMENTARY (The Chapter that is not a Chapter)
This chapter, numbered 0, corresponds to the Negative, which is before Kether in the Qabalistic system.
The notes of interrogation and exclamation on the previous pages are the other two veils.
The meaning of these symbols is fully explained in "The Soldier and the Hunchback".
This chapter begins by the letter O, followed by a mark of exclamation; its reference to the theogony of Liber Legis is explained in the note, but it also refers to KTEIS PHALLOS and SPERMA, and is the exclamation of wonder or ecstasy, which is the ultimate nature of things.
NOTE
[1] Silence. Nuit, O; Hadit; Ra-Hoor-Khuit, I.