One well-known instance occurs in the history of the third century of St. Mary's interposition, and it is remarkable from the names of the two persons, who were, one the subject, the other the historian of it. St. Gregory Nyssen, a native of Cappadocia in the fourth century, relates that his name-sake Bishop of Neo-cæsarea, surnamed Thaumaturgus, in the preceding century, shortly before he was called to the priesthood, received in a vision a Creed, which is still extant, from the Blessed Virgin at the hands of St. John. The account runs thus: He was deeply pondering theological doctrine, which the heretics of the day depraved. "In such thoughts," says his namesake of Nyssa, "he was passing the night, when one appeared, as if in human form, aged in appearance, saintly in the fashion of his garments, and very venerable both in grace of countenance and general mien ... Following with his eyes his extended hand, he saw another appearance opposite to the former, in shape of a woman, but more than human ... When his eyes could not bear the apparition, he heard them conversing together on the subject of his doubts; and thereby not only gained a true knowledge of the faith, but learned their names, as they addressed each other by their respective appellations. And thus he is said to have heard the person in woman's shape bid 'John the Evangelist' disclose to the young man the mystery of godliness; and he answered that he was ready to comply in this matter with the wish of 'the Mother of the Lord,' and enunciated a formulary, well-turned and complete, and so vanished." Gregory proceeds to rehearse the Creed thus given, "There is One God, Father of a Living Word," &c. Bull, after quoting it in his work upon the Nicene Faith, refers to this history of its origin, and adds, "No one should think it incredible that such a providence should befall a man whose whole life was conspicuous for revelations and miracles, as all ecclesiastical writers who have mentioned him (and who has not?) witness with one voice.
Essay on Development Chapter 10.