I want to know the answer to the following question:
Who was compelled to write of this instance that was also an author of one of the book of the Bible ?
All the background I'm provided with is that "Nazianzen's title of Mary at the Annunciation as "prepurified" was subsequently adopted by all theologians interested in his Mariology to justify the Byzantine equivalent of the Immaculate Conception.". Is that enough to answer the question?