Consciousness takes the pride of place because any experience means being conscious of other 4 aggregates. When I am conscious of something it means something is PRESENT to me. Sight is present to me. I am conscious of it. Consciousness without an object of which one is conscious --a ’ pure consciousness ’ is an impossibility, an inconceivability. We cannot have 'consciousness of consciousness ’ like 'presence of presence '. Though we speak consciousness and objects separately they are inseperable in experience. When spoken separately they are mere verbal abstractions. When in this abstract way we speak about consciousness the Suttas tell us that we are making an “aggregate designation” MN.Sutta 109. As against this when we speak of “consciousness of X” we are speaking of a concrete and particular thing and not something abstract.
The Suttas do not speak of varying degrees of consciousness such as unconsciousness or sub-consciousness, however they speak of state wherein feeling and perception have ceased, and therefore consciousness to have ceased. But there is the heat and vitality in the body, and so there is a return to consciousness at the end of the time predetermined before the attainment of that state called “sañña vedayahita nirodha Samapatti”. MN Sutta 44.
Also consciousness does not refer to the phenomenon or even a part of the phenomenon. It is only the PRESENCE of the phenomenon. In an immediate visual experience “the thing is seen” though eye consciousness is not seen. Eye consciousness is negative as regards to essence. But reflexively there is eye consciousness.
So we have a situation wherein consciousness is that upon which other things depend on for their EXISTENCE. And that merely means that consciousness is the EXISTENTIAL DETERMINATION.
Since consciousness is negative regarding to essence it is always associated with the body. It is fastened there, bound there. (ettha sita ettha patibaddha) MN.sutta 77. Therefore in the Suttas we get the phrase “body endowed with consciousness”.
Normal experience is however multiple, that is, in an experience there is seeing, hearing, touching, etc. the experience is not confined to one faculty alone and so we have six kinds of consciousness arise dependent on Six Bases. The World is described as these six bases. World perceiving and world conceiving.
Need to remember that the mind base can be regarded as incorporating five imaginary perceptions and along with their respective consciousness, eye consciousness ear consciousness etc. So we can expand the earlier statement to “six+based body endowed with consciousness”.
I hope the above would give you a sufficient understanding of Consciousness.
With Metta
Sunil
