Universal Mind
The totality of all that exists, with all this variation, is
the Universal Mind or Nous. The Nous includes everything that
exists in reality, with all the differentiations. It includes
everything that can be perceived or experienced and anything that
can be conceptualized. (Diamond Heart Book 4, pg 332)

We call it the Universal Mind because when we go beyond it, we
see it as mind. But it is not mind as created by me personally.
It’s the mind that actually exists as the totality of the
Universe. Some people call it God’s mind. So from the level
of the nonconceptual, the physical universe and Essence and all
that exists are mind. They are concepts, like ideas or forms that
are filled out with something. What they are filled out by is
the nonconceptual, the original consciousness. (Diamond Heart
Book 4, pg 343)

Universal mind and imagination
The imagination of the universal mind. It is not your own imagination.
You are being imagined all the time, so is the chair and everything
else, just like being a figure in a dream, and the figure in the
dream believes he or she is real. Imagine you have a dream when
you see people and one of those people believes that they are
really real while they are being dreamed by you. Your situation
is exactly like that. Exactly. This is what is referred to as
the Universal Mind, or the Divine Mind. (Diamond Heart Book 4,
pg 121)

The mind that knows is pure presence itself, which knows its
own differentiations. It is the knowing of Being, the knowing
of true existence, differentiated into the knowing of beings and
existents. It knows through the soul, for it needs to be localized
for there to be discriminated knowledge of forms. It provides
the soul with her knowing faculty, with her mind and intellect,
just as the dimension of divine love provides her with her heart
and feelings. This means that it is not an individual soul that
knows, although that is how things appear. When we know the boundless
dimension of pure presence, which is the dimension of pure basic
knowledge, we recognize that it is basic knowledge that knows.
Basic knowledge is a dimension of true nature, and not limited
to the individual soul. It operates through the soul; for the
soul is the organ of perception, similar to how the eye is the
organ of seeing for the body but it is not exactly the eye that
sees. (Inner Journey Home, pg 315)