Song of the Stele

Stele of Revealing

From the 26th Dynasty of Egypt in Thebes, the Priest of the god Mentu, Ankh-ah-na-Khonsu, created the Stele of Revealing (although it was not called this until much later).

It is from the translation of the hieroglyphics on this Stele that the Song comes from, the supreme mantra of Thelema (Aleister Crowley referred to this mantra as the “holiest of all” in Book 4).

a ka dua
tuf ur biu
bi a’a chefu
dudu nur af an nuteru

“Unity uttermost showed!
I adore the might of Thy breath,
Supreme and terrible God,
Who makest the gods and death
To tremble before Thee –
I, I adore thee!”

An effective and simple method of rapidly establishing an active current of Light in the sphere of sensation is to use the Egyptian mantra in conjunction with a Middle Pillar type practice, incorporating the Four Worlds map of consciousness. In this method, each line of the mantra is associated with one of the Four Worlds, thus:

Atziluth 
A ka dua
Sahasarachakra
Kether
Briah
Tuf urbiu
Anahattachakra
Tiphareth
Yetzirah
Bi a’a chefu
Svadhisthanachakra
Yesod
Assiah
Dudu ner af an nuteru
Muladharachakra
Malkuth
The entire paraphrase in english is a powerful micro-ritual in and of itself, serving as an effective invocation of the Light also along the lines of a modified Middle Pillar ritual, in that each stanza may be associated with one of the 4 Worlds, utilizing the Gate Sephiroth
of Kether, Tiphereth, Yesod, and Malkuth to rise through the different levels of consciousness as one ascends the Tree, or bring the current  down the Tree to ground into matter.
Standing straight up, hands to the sides, visualize your sphere of sensation filling with radiant white light, with a barely perceptible field of blue light at the outer perimeter of the aura. With this current of energy coursing through your system, say:
I am the Lord of 
Thebes, and I
The inspired forth-speaker of Mentu;
For me unveils the veiled sky,
The self-slain Ankh-af-na-khonsuWhose words are truth.
I invoke, I greetThy presence, O Ra-Hoor-Khuit!
Next, proceed to establish the Middle Pillar with the following actions:
 
Atziluth
Kether. Visualize Divine white brilliance above the head at the sahasarachakra as a radiating luminescent sphere.
 
Unity uttermost showed!
I adore the might of Thy breath,
Supreme and terrible God,
Who makest the gods and death
To tremble before Thee: —
I, I adore thee!
 
Briah
Tiphereth. Bring a current of white light down from the Kether sphere to the anahattachakra at the chest, where a brilliant rose-gold solar sphere of radiant fire appears.
Appear on the throne of Ra!
Open the ways of the Khu!
Lighten the ways of the Ka!
The ways of the Khabs run through
To stir me or still me!
Aum! let it fill me!
Yetzirah
Yesod. The current of white light extends down from the chest to the genitals at the svadhisthanachakra, as a sphere of brilliant luminescent violet light emerges.
The light is mine; its rays consume Me:
I have made a secret door
Into the House of Ra and Tum,
Of Khephra and of Ahathoor.
I am thy Theban, O Mentu,
The prophet Ankh-af-na-khonsu!
Assiah
Malkuth. The scintillating column of white light descends from the genitals to the feet representng the muladharachakra, where a sphere of brilliant citrine light appears.
By Bes-na-Maut my breast I beat;
By wise Ta-Nech I weave my spell.
Show thy star-splendour, O Nuit!
Bid me within thine House to dwell,
O winged snake of light, Hadit!
Abide with me, Ra-Hoor-Khuit!
Now pause to see the four spheres of radiant light, and the central column of brilliance connecting them all. From this point, one may wish to go into meditation, invocation of the Holy Guardian Angel, or other forms of ritual and meditative Work.
This practice is incorporated into several other techniques that are described in my book. 
Recently, I came across an evocative musical chant of the Song of the Stele. Check it out here