I want to know the answer to the following question:
What procedure was being performed while he gave his reasoning ?
All the background I'm provided with is that "Beginning with St. Gregory Nazianzen, his explanation of the "purification" of Jesus and Mary at the circumcision (Luke 2:22) prompted him to consider the primary meaning of "purification" in Christology (and by extension in Mariology) to refer to a perfectly sinless nature that manifested itself in glory in a moment of grace (e.g., Jesus at his Baptism).". Is that enough to answer the question?
Answer: yes