Good Mother
The deepest layers in both self and object images are composed
of undifferentiated self-object representations. So the deepest
and most basic layers of the "good" mother image are
primarily those of the "good" undifferentiated self-object
representations. So when an individual feels the loss, or possibility
of loss, of the mother's image, he might be feeling the loss of
these deep layers. The deepest experiences of losing mother must
be those of the loss of these undifferentiated representations...
Our view is that the loss of the "good" undifferentiated
representation leads to the activation of the Merging Essence.
(The Pearl Beyond Price, pg 229)

Good mother, separation and conflict
The obvious implication is that physical and emotional separation
become possible because -- besides the maturation of body and
mind -- mentally and emotionally one remains close to mother.
The sense of self does not feel abandoned by the mother, does
not feel completely alone, because mother is still around, as
a cathected image. So one can feel independent and can function
in a separate and autonomous manner because there is a constant
(although mostly unconscious) feeling of the mother's nearness...
now we can use this understanding to see what happens when one
experiences Being, as in the state of the Personal Essence. The
experience of the Personal Essence feels like a sense of autonomy,
independence, individuation and so on. However, since one still
identifies with ego or reverts to this identification, one believes
that such autonomy is more separation than one can handle. One
feels that his distance from mother, emotionally, is becoming
bigger, and this is felt as a threat to his sense of identity,
as a pressure on his level of integration. And if the individual
still has unresolved conflicts about separation, dating back to
the first few years of life, then this will be activated by the
pressure of the essential experience. (The Pearl Beyond Price,
pg 217)