Activity
The past exists in us as activity, and the content
of personality is an activity, a movement. Ego activity is the
substance of suffering; it is contraction itself. You can see
this more specifically if you look at the activity in the centers
of the body. If you look at the activity in the head, you’ll
see concern and worry. In heart, it’s a sense of guilt and
frustration. Looking at activity in the belly, you’ll see
it as attachment and desire. But it is all the same thing: ego
activity. And ego activity is always concerned with issues from
your past. It is what is called personal karma, or the wheel of
life and death. It is the movement of your mind, your personality,
your choices, preferences, judgments, resistances – anything
you do actively. (Diamond Heart Book 4, pg 10)

Essence and activity
Once you know yourself to be the Personal Essence,
what you do doesn’t matter much. You choose what will enlarge
and enhance your real self. There can never be a sense of lasting
fulfillment unless you have realized that essential part of yourself.
Nothing else can take its place. (Diamond Heart Book 1, pg 7)

Activity and Being
When we say that you are not an independent doer,
this does not mean that in the objective view, there is no feeling
of functioning happening through you -- it is not that you don't
feel you are moving your arms or talking, nor is it the sense
that someone or something else is moving you. It is a different
perception in which you see that all functioning, all doing, all
activity is happening as one thing. What you are doing and what
everyone else is doing is all part of the same movement, so there
is no isolated functioning separate from that one flow of activity.
When you are driving your car and you see others are driving their
cars, instead of perceiving that each of you is engaged in a separate
activity, from this perspective, you would see that you and everyone
else you pass on the road are all manifestations of the same thing.
There are not separate individuals at this level. At a still deeper
level, you realize that not only are you and everyone else manifestations
of the same reality, but the cars are also manifestations of that
reality, and the road itself. The car and you and the driving
itself are all the functioning of Being, and so in reality there
is no one driving a car. Then you realize that you have never
driven from one place to another, that reality has simply manifested
in such a way that it appears as if you have driven a car on a
road. (Facets of Unity, pg 271)