The English rendering of Buddhadhatu ("Buddha element, cause, metal, root, principle, or element"), which is itself a description of the Sanskrit word Tathagatagarbha, "the embryo or seed of a Buddha." Variously called sugatagarbha, buddhata, or Essence.
"The Buddhadatu, the Buddhist principle, exists within the interior of every human being who is not yet in the final state of degeneration. This Buddhadatu is the psychic material or raw material that can be fabricated into what is called a Soul [i.e. a Buddha]." - Samael Aun Weor, The Revolution of the Dialectic