I will argue that consciousness is not a thing. “Consciousness” is the word we use to describe the subjective feeling of a number of instincts and/or memories playing out in time in an organism. That is why “consciousness” is a proxy word for how a complex living organism operates. And, to understand how complex organisms work, we need to know how brains’ parts are organized to deliver conscious experience as we know it.

Consciousness is not wholly, nor even primarily a device for receiving sense-impressions. … there is another outlook than the scientific one, because in practice a more transcendental outlook is almost universally admitted. … who does not prize these moments that reveal to us the poetry of existence?

The consciousness that says 'I am' is not the consciousness that thinks.

Consciousness is the ability to understand, that is, to be able to have a sentient experience of sensations and feelings and to understand their meaning. This goes beyond what a computer can do. Consciousness is a phenomenon that emerges from a deeper reality that cannot exist in space-time and cannot be explained by classical physics. Only the 'quantum state' can describe conscious experience, so by necessity consciousness must exist before matter, energy, space and time. Physical phenomena, which are more virtual than real, are the creation of a conscious field that observes objects moving in spacetime through the body controlled by the field. The quantum state of the field is the representation of qualia, i.e. the sensations and feelings that constitute a conscious experience. Qualia can only be known by the field that is in that state and go beyond what is representable by a mathematical concept.

Consciousness is simply the light by which the contours of mind and body are known. It is that which is aware of feelings such as joy, regret, amusement, and despair. It can seem to take their shape for a time, but it is possible to recognize that it never quite does. In fact, we can directly experience that consciousness is never improved or harmed by what it knows. Making this discovery, again and again, is the basis of spiritual life.

There is no such thing as a complete consciousness.

There is no scientific explanation for consciousness yet it is.

Consciousness is a much smaller part of our mental life than we are conscious of, because we cannot be conscious of what we are not conscious of.

Consciousness is the one thing in the universe that cannot be an illusion — even if I'm a brain in a vat, all my memories are false, and my perceptions are of a world that doesn't exist, I'm still having an experience.

Consciousness is a being the nature of which is to be conscious of the nothingness of its being.

We have not the remotest realistic inkling of a consciousness which is not self-consciousness.

Chalmers: It’s awfully hard to define consciousness. But I’d start by saying that it’s the subjective experience of the mind and the world. It’s basically what it feels like, from the first-person point of view, to be thinking and perceiving and judging.

Consciousness is a mystery that faces the mystery of potential and transforms it into actuality. We do that with every choice we make. Our choices determine the destiny of the world. By making a choice, you alter the structure of reality.

Without consciousness there would, practically speaking, be no world, for the world exists as such only in so far as it is consciously reflected and considered by a psyche. Consciousness is a precondition of being.