Regression
In the psychodynamic process of understanding the personality,
one undergoes a regression which proceeds through the following
major steps:
- Disidentifying with parts of the psychic structure leads to
the experience of deficient emptiness.
- The deficient emptiness leads to the experience of space.
- Space leads to the awareness of Being (The Void, p 129)

Types of regression
Grandiosity: This is a regression which is an attempt to return
to the feelings of grandeur and omnipotence that characterizes
the practicing period of the separation-individuation process.
Negative merging: This regression is an attempt to regain the
omnipotent comfort and support of the good merged state, characteristic
of the dual unity of the symbiotic phase; in other words, it is
an attempt to regain the loving support of the Merging Essence.
Isolation and detachment: This regression is an attempt to regain
the sense of differentiation and strength characteristic of the
differentiation sub phase. This defense gives the individual a
sense of isolation which is actually an extreme sense of separateness.
This happens when one feels too inadequate to be present and still
feel separate, reflecting the absence of the Strength Essence.
(The Pearl Beyond Price, pg 373)

Merging Essence and regression
The merging Essence is repressed at the symbiotic stage of the
process of ego development. At this stage, the ego has not developed
as a separate entity on its own. Regressing to this stage means
the ego must regress to the form it had before it developed into
a cohesive entity. Of course, this will arouse the ego's fear
of loss of cohesion, loss of integration, and loss of its object
status. In fact, the person must experience and tolerate the disintegration,
which, if understood, will turn out to being nothing but experiencing
himself as empty space. (Essence, pg 117)