Among their topics are hierarchy and love in St. Dionysius the Areopagite
, Orthodox Christianity and the failure of environmental history, creation in the liturgies for the feasts of the Theotokos, and natural and supernatural revelation in early Irish and Greek monastic thought.
Toma proposes that within a cosmology that remains open to theology, "the data of science, removed from the secular paradigms under which it is presented, positively contribute to the Catholic faith and our understanding of the material world in which we live." Such a cosmology can be found, he suggests, in the concept of the hierarchy of being, "synthesized by St. Dionysius the Areopagite
and commented on by Aquinas." The universe leads progressively and by stages up through such a hierarchy, leading the human person to the fulfillment of communion with God.