Consciousness is primary.  Primary Consciousness is written with a capital "C".  Taking into consideration that no human word or thought does justice to the un-namable and un-definable, Consciousness could be called Source Energy, the Source of Being, the Causeless Cause, the Rootless Root, and the Ultimate Reality.   It can be called the Absolute.  It could also be called pure Love.   It is seen as the agent, the driving force that is creating and maintaining the entire universe including our gross-physical time- space reality (the physical cosmos) as well as the countless finer vibrational realms.  Consciousness is eternal and infinite.  It is    TAT TVAM ASI (I am That, Though are That, all this is That). Consciousness exists.  Out of itself, it is continuously creating and maintaining all worlds, our material world included.  Everything in our physical world including humans is of its essence.  We are it.   Matter is crystallized or condensed Consciousness.  Energy is fluid Consciousness.  Everything is it.  Albert Einstein once wrote:   "Everything is emptiness, and form is condensed emptiness. " Our human consciousness is intimately connected to and part of that all-encompassing universal Consciousness.  When our individual human consciousness is advanced, it can avail itself of the unlimited intelligence and creativity of nature in an unrestricted way and to a full extent. As humans, we can directly experience "pure" Being, Transcendental Consciousness (e.g. in Transcendental Meditation), because we, as everything else, ARE IT.  Hence the name human "beings" (not human doings, humans thinkings, human talkings, etc.).  But we cannot talk about that experience, because it defies words.  Words can capture the manifestations of Consciousness, its expressions in all the worlds, physical and others, but not the fundamental essence - the nameless, unspeakable - itself. We constantly refer to ourselves as I.  Without the ongoing development of higher states of consciousness, statements such as "I think, I feel, I do" are rather meaningless, because it is unclear who the "I" is.  If I don’t know the fullness and grandeur of myself, how can I make any meaningful statement about myself?  The "I" is the originator of the thoughts, feelings, and actions.  Who is the "I"?  How can a weak foundation carry a strong building?  If the "I" is not fully developed, it is as if one were to apply a straw to siphon off for one’s use the waters of a mighty stream.  Appropriately, Maharishi Mahesh Yogi termed the phrase:  "Knowledge is structured in Consciousness."