Tunnels of Set

Full magical initiation is not possible without an understanding of the so-called qliphotic paths which are, in practice, as real as the shadow of any object illumined by the sun. In other words, the well-lit highways of Horus, the paths that man has projected to connect the cosmic power-zones (Sephiroth) with his own consciousness, have their counter-parts in the Tunnels of Set, a dark web or nocturnal network of paths, the very existence of which is denied or ignored by those who are unable to realize the total truth of the Tree and its validity for those who would climb even its lower branches.

[…]

I am fully aware that the averse regions of the power-zones are dangerous territory, and at the outset I would remind those who feel that such an exploration had better not be made that one cannot begin this initiation, or journey inward, as one begins one’s ascent from Malkuth, for only by projecting consciousness through Daäth, the Gate of the Abyss, can one enter the Kingdom of infernal spaces that is under the dominion of the Choronzon. One has therefore to be familiar with these paths before one can enter the Deep Place where they continue, not as well-lit Ways of Horus plainly signposted in the light of day, but as the Tunnels of Set that turn and twist like a serpent, or like the entrails of that nameless God of the Gulf whose darkness makes possible, by contrast, their light counterparts.   If this is borne in mind it will not be necessary to charge me with irresponsibility towards those who may be lured, even against their will, to commence a journey for which they are improperly equipped and which may therefore prove fatal.

Grant, K. (1977). Nightside of Eden (1994 ed.). London: Skoob.