The Past
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 the 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)

Personality and the past
What are the impurities of the personality? What will be clarified
from the personality? The answer is simple: the past. The thickness,
the dullness, the suffering that you experience as the personality
are there because the personality does not exist in its pure form.
It carries the past with it, and the past exists as conflicts,
memories, undischarged feelings, misunderstandings, ignorance,
and all the reactions, associations, and fantasies corresponding
to all the ignorance from the past. (Diamond Heart Book 4, pg
5)

Reality and knowing
The moment you know what to do, you are already using the past.
You are already taking direction. You’ve already separated
things: you are choosing one part of your mind over another when
you say, “I know what to do.” Knowing reality, knowing
what to do about it, wanting something from reality, and desiring
it, feeling dissatisfied by it – all these are indications
of living in the old, dead world. (Diamond Heart Book 4, pg 146)