When one takes energy that belongs to another(soul fragments), the energy taken can not be used by any but the soul it is a missing pieces of. Well the energy has often been taken unaware of what is being done the effects are real, and are the same as when the soul gives pieces if it's self away. Often steaming from neediness to be with another is the act of unconsciously or consciously giving pieces of self away, or having them taken away by another(which can only happen if the soul lets it happen). Without some of it's energy the soul has less power and can not do nearly as much as when it is complete and whole with no missing pieces of soul.
The source of infinite energy lies within. Connecting with source directly is much more pure. In a state of impurity one can not see clearly. Feeding off of soul energy diminishes them while furthering impurity. Vampirism is self sustaining as it's breeding ground is an impure and weakened state, and victims are liable to end up with weakened constitutions and polluted from their perpetrators invasion.
"As a karma is enacted, the victim loses energy to the perpetrator. The perpetrators accrues energy from the victims. All this defined energy of emotions, energy signatures, informational records of self , becomes very dense in the body of another – as all nonmoving energy and thoughtform changes, stagnates, in this stagnation becomes ‘dense’.
One could say that dogma is non-moving and therefore non-evolutionary.
The same for this energy sitting in the unconscious realms of others.
The unconscious is ‘etherically speaking’ in the space between the meridians in the etheric body.
All this accrued or lost, dissonant energy, is the lost consciousness.
Loss causes a loss in the blueprints, (as they are affected with every karma) therefore with every subsequent incarnation the individual incarnates with less information. And a loss in the etheric body realms (in the unconscious).
Accrual of anothers matter, causes the etheric body realms to now ‘clog up’ with too much matter of others (dissonant to self). And now, the unconscious of both, with so much karma… is all about karma.
Every disease, personality abherration, relationship dysfunction – personal and global."
I was looking for something a read before on the matter which I'm yet to find, but I found this which explains it well.
"The Grand Retreival and Return by Soul – healing the human and completing Soul... Which we all do, by clearing/completing the karma, where your past mastery self, lost these higher consciousness truths and abilities."
"Or where they were siphoned from you/your past self , by beings wanting this knowledge, without having to do the hard inner work to prove the integrity of self, to acquire all the sacred truths and sciences."
I won't bother quoting anymore though there is more that's relevant here's the link for the article
http://forum.visionary-spiritual-institute.com.au/showthread.php?t=450