An Omnipresent, Eternal, Boundless, and Immutable Principle on which all speculation is impossible, since it transcends the power of human conception and could only be dwarfed by any human expression or similitude. It is “beyond the range of speech and thought”—in the words of Māṇḍūkya Upaniṣad, “unthinkable and unspeakable.”
To render these ideas clearer to the general reader, let him set out with the postulate that there is one absolute Reality which antecedes all manifested, conditioned, being. This Infinite and Eternal Cause—dimly formulated in the “Unconscious”and “Unknowable” of current European philosophy—is the rootless root of “all that was, is, or ever shall be.” It is of course devoid of all attributes and is essentially without any relation to manifested, finite Being. It is “Be-ness” rather than Being (in Sanskrit, Sat), and is beyond all thought or speculation.
This “Be-ness” is symbolised in the Secret Doctrine under two aspects. On the one hand, absolute abstract Space, representing bare subjectivity, the one thing which no human mind can either exclude from any conception, or conceive of by itself. On the other, absolute Abstract Motion representing Unconditioned Consciousness. Even our Western thinkers have shown that Consciousness is inconceivable to us apart from change, and motion best symbolises change, its essential characteristic. This latter aspect of the one Reality, is also symbolised by the term “The Great Breath,” a symbol sufficiently graphic to need no further elucidation. Thus, then, the first fundamental axiom of the Secret Doctrine is this metaphysical One Absolute—Be-ness—symbolised by finite intelligence as the theological Trinity.
H.P. Blavatsky The Secret Doctrine Book 1 page. 14