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We know the meaning of consciousness
so long as no one asks us to define it.
-William James

To be conscious means to be aware, to know, to perceive, to observe.

The content of consciousness is your belief, your pleasure, your experience,

the particle of knowledge that you have gathered,

either through external experience or through your fears,

attachments, pain, the agony of loneliness, sorrow,

the search for something more than physical existence;

all that is one's consciousness with its content.

-Jiddu Krishnamurti

There is no term [consciousness]
at once so popular and so devoid of standard meaning.
How can a term mean anything
when it is employed to connote anything and everything,
including its own negation?
One hears of the object of consciousness and the subject of consciousness,
and the union of the two in self-consciousness;
of the private consciousness, the social consciousness,
and the transcendental consciousness;
the inner and the outer, the higher and the lower,
the temporal and the eternal consciousness;
the activity and the state of consciousness.
Then there is consciousness-stuff, and unconscious consciousness...
and unconscious physical states or subconscious...
the list is not complete, but sufficiently amazing.
Consciousness comprises everything that is, and indefinitely much more.
It is small wonder that the definition of it is little attempted.
-Ralph Barton Perry

Our normal waking consciousness,
rational consciousness as we call it,
is but one special type of consciousness,
whilst all about it,
parted from it by the filmiest of screens,
there lie potential forms of consciousness entirely different.
-William James

As we take, in fact, a general view 

of the wonderful stream of our consciousness,

what strikes us first is this different pace of its parts.

Like a bird's life, 

it seems to be made of an alternation of flights and perchings.

-William James

The unconscious is not personal,
 but in order not to be swamped by infinite information,
the brain functions as what Aldous Huxley called a "reducing valve."
It shuts out the universe so that the individual can do what is in front of him.
The million signals a second 

must be reduced to the few a second of the conscious mind.
But the intuition and the imagination maintain an opening to the unconscious,
which contains all the information 

that could not register in immediate consciousness.
Since the immediate consciousness must work
in a step-be-step incremental sequence of events,
its perception of time is linear.
Clearly, all the information cannot be restricted to that line,
and so the time of the unconscious is out of time,
the line must be widened and lengthened until it becomes a sphere
if one is to achieve cosmic consciousness.
In the space-time of the unconscious,
the past and the future mysteriously interpenetrate.
-William Irwin Thompson

To those who have fully experienced the joy of operating consciously,

the feeling is I = consciousness = aliveness.

-Nathaniel Branden

Inner states of consciousness
wield an evermolding influence upon matter
and hew out ever varying forms.
-William Walker Atkinson, "A. P. Mukerji"

Consciousness flourishes through contrasts -

by separating figure from ground.

-Jacquelyn Small

Analysis does not transform consciousness.
-Jiddu Krishnamurti

You must generate the conviction:
"I am the all-pervasive consciousness
in which all bodies and minds in the world are appearing and disappearing,
I am that consciousness which remains unchanged and unaffected
by these appearances and disappearances".
Stabilise yourself in that conviction.
That is all you need to do.
-Annamalai Swami

God consciousness is the final

stage of the journey.

Christ consciousness indicates that

you are almost there.

-Leonard Jacobson