Man and Sin by Piet Schoonenberg (1964) 1.7BM
Summary of text [comment] pages 55 and 56
[Once we view ourselves as living and working within a spontaneous order, then the devil cannot be an independent divine substance. The devil exists only within a spontaneous order.
The devil plays within the dynamics of any spontaneous order in the same way that a parasite plays within the dynamics of its host. Devils divert energy from the entire system in order to preserve themselves in being, thereby weakening the entire order.
Devils, then, may possess a person, an organization, an institution, or a society in the same fashion that a parasite possesses its host. Like a parasite, the devil looks for vulnerability and power.
The devil exploits the spontaneous order in order to harvest power (and souls) for itself.]