Appealing to the work of Lothar Schafer, I then explore this analogy in a way that understands spirit as the realm of potentiality and body as the realm of actualization, emphasizing that potential or virtual states are just as much a part of reality as occupied states in quantum physics; thus analogously all our potential, including what is unfulfilled, remains part of the reality of who we are as persons.
Once I have explained the scientific image, I will use it to describe spirit as our wave of potentiality and probability and body as our actualization of that potential.
The concept of particle/wave complementarity can provide a useful analogy in theological anthropology to talk about the relationship of body/ spirit, using the concept of wave function as potential and probability and particle as the actualization of one of those probabilities.
But transcendental freedom is always actualized through individual choices in time and space; this actualization Rahner calls "categorial freedom.
Having laid down the basic concept of particle/wave complementarity and the analogy of body/spirit in terms of actualization and probability, I want to delve a bit deeper into the interpretation and the implications of this complementarity, using the articles Lothar Schafer published in Zygon in 2006 and 2008.
Rahner maintains that even a choice to reject God is an actualization of one's freedom, and that freedom is grounded in God and borne by God.
The actualization of our potential occupies one possibility of our infinite potential.