Ego Activity
But it's a vicious cycle, as you can see. The more you reject,
the more there is contraction, the more frustrated you become.
Then you want to do something that will release the frustration.
But you do this by hoping for something in the future and rejecting
the present, which creates more frustration, which makes you hope
even more to release it. So you hope some more, you push, and
more frustration is created. This cycle generates the personality,
and it is the experience of the personality itself. This cycle
is what we call ego activity. When you feel it, the actual substance
of the personality is a feverishness, a lack of stillness, a lack
of contentment. When you feel desire, it's that frustration, too.
Part of the desire that we feel is a rejection of the present
and a hope for something else, which brings frustration. The very
movement of the personality is frustration, and the existence
of the personality is that movement. The very existence of the
personality is that reactivity. It's a reaction, not a spontaneous
action. (Diamond Heart Book 3, pg 179)

Some teachings see ego in terms of its activity, which is primarily
desire for future pleasure. This desire for pleasure, which entails
avoidance of pain, involves rejecting the present situation and
hoping for a better one. The cycle of ego activity is thus rejection,
hope and desire; it is based on memories of past experience, and
is directed towards the future. Thus ego, which here is an activity
which resists the present moment, is clearly antithetical to the
perception of the nature of reality, which involves being in the
moment. (The Pearl Beyond Price, pg 20)

By pitting yourself against what is, you are acting
according to the delusion that you have a separate will and that
you can have your own way, different from what is happening. This
is one of the principles of ego: that you have a separate will
and that you have choice. Even when you believe that you are helpless
and can't do things, there is the implicit belief that if it weren't
for your helplessness, you could have your own way. From this
egoic perspective, it seems obvious that you need to tinker with
things, both inwardly and outwardly. This manifests externally
as manipulating other people to make them conform to how you think
they need to be for you, and internally as constantly evaluating
your experience to see whether it is "right" or not,
and trying to change it if it doesn't match your ideas of how
you think you should be. "What state am I in? Oh, no! I'm
being reactive -- that's no good -- I should be just being. Now
I'm being. Good, good. I should stabilize that," and so on,
as if it were up to you to make your state become this or that.
If you contemplate your experience, you will see this constant
activity. The moment you are identified with your ego, you are
involved in this activity of trying to make yourself feel better,
and not scared or unhappy or empty. All ego defenses are based
on this principle of changing your experience to make it conform
to how you think it should be. (Facets of Unity, pg 129)

Reality and ego
The I, the ego, is engaged in continual activity: rejecting,
wanting, justifying, judging, discriminating. This activity itself
is suffering, and is the source of the point of view which believes
in its separateness. As long as you are engaged in any desire
to change things inside you, to want something to be different,
you're coming from ego and identified with that point of view.
You cannot perceive reality as long as you are looking at the
world from the perspective of ego. To act from that point of view
means to perpetuate it. The moment you think of change, of fundamental
transformation, of enlightenment, you are speaking from the point
of view of the ego. (Diamond Heart Book 2, page 140)