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How he says to do it
Standing in a straight position, let us raise our arms in order to form a straight line with the whole body, and after praying and asking for help to our Divine Mother we must sing the Mantra ISIS, as follows: IIIIIIIIISSSSSSSS….IIIIIIIIIIISSSSSSSSSS. Prolong the sound of the two letters and divide the word in two syllables IS-IS. [sounding of the letter I is similar to that found in the word “tea”] Afterward, the student must lay down with his relaxed body and filled with ecstasy must concentrate and meditate on the Divine Mother.
Runic Magic, 1969 · ch. 7, Rune Is · read it in The Science of Meditation
Why
Let us now practice with the Rune IS and let us meditate on the Divine Mother Kundalini.
Runic Magic, 1969 · read it in The Science of Meditation
Mystery of the Fire