Aggression
As it is a suppressive agent, the superego uses the energy of
aggression in its control of the ego. Most of this aggressive
energy is nothing but the aggression that the child experienced
toward the coercive agencies in childhood. Now this aggression
is used by the superego to punish the ego; that is, it is retroflected.
(Work on the Superego, pg 4)

Therefore it is the aggression of the instinct of self-preservation
that the superego directs towards the ego. (This aggression is
actually a distorted expression of the vitality of the life force,
which has the essential aspect of Strength as its primary element.
(Work on the Superego, pg 5)

It seems to us that the concepts of neutralized aggression and
aggressivity are closely related to the Strength aspect of Essence.
It is seen as the energy powering the process of separation-individuation.
We are not aware of any energy having this function besides that
of the Strength Essence. It is our understanding, also, that the
Strength Essence is the force behind what is often called the
instinct for self-preservation. This idea is developed in our
article "Essence and Sexuality" (Energy and Character,
volume 14). So we do not really have to look to biology to find
the true aggressive energy for the organism; it is one of the
aspects of Essence. It is interesting, however, that psychoanalysis
considers the aggressive energy, or drive, as negative in nature,
or at least instinctual; and that it needs to go through the process
of neutralization to be utilizable for developmental purposes.
Our perception is the opposite. The aggressive energy is, from
the beginning, and, in fact, innately and always, "neutralized."
It is the Strength of Being, and hence it is the prototype or
archetype of all capacities of strength at all levels. When present
it infuses the organism with an innate strength that affects all
levels of functioning. It gives the organism the sense of capacity,
of the ability to exercise any of its functions. Its effect is
to expand the capacity of the organism so that all its functions,
at all levels, the physical, emotional and Being -- are strengthened.
Thus it aids the process of separation and of essential development.
It is the fire for it, the fuel that keeps it going. It is energetic,
like fire. It is expansive, so it naturally leads to greater expansion
of the organism, which is fundamentally what development is. Above
all, it is an innate potential of the human being, an aspect of
Essence, indestructible and inexhaustible. (The Pearl Beyond Price,
pg 211)