1. The brain predetermined by Great Nature for the concentration and further actualizing of the first holy force of the sacred Triamazikamno, called the Holy-Affirming, is localized and found in the head. 947 XVII
2. The second brain, which transforms and crystallizes the second holy force of the sacred Triamazikamno, namely, the Holy-Denying, is placed in their common presences, also as in us, along the whole of their back in what is called the 'spinal column.' 948 XVII
3. But as regards the place of concentration and source for the further manifestation of the third holy force of the sacred Triamazikamno, namely, the Holy-Reconciling — the exterior form of this being-brain in the three-brained beings there bears no resemblance whatever to ours. 949 XVII
This Most Great Foundation of the All-embracing of everything that exists, constantly emanates throughout the whole of the Universe and coats itself from its particles upon planets - in certain three-centered beings who attain in their common presences the capacity to have their own functioning of both fundamental cosmic laws of the sacred Heptaparaparshinokh and the sacred Triamazikamno - into a definite unit in which alone Objective Divine Reason acquires the possibility of becoming concentrated and fixed. 1592 XXI
~ Beelzebub's Tales to His Grandson, G.I. Gurdjieff, c. 1950 G. Gurdjieff, E.P. Dutton & Co., Inc., 1964
Here is a link to a great resource; an index to Gurdjieff and related 4th Way documents:
http://www.gurdjieff-bibliography.com/Current/index.html
Blessings
