Jubilee for the Marian Shrine in Orissa. Christians: "We entrust our suffering to Mary" http://www.fides.org/en/news/65678-ASIA_INDIA_Jubilee_for_the_Marian_Shrine_in_Orissa_Christians_We_entrust_our_suffering_to_Mary (6 March 2019)
“She is rightly called not only the mother of the man, but also the Mother of God … It is certain that Mary is the Mother of the real and true God.”
Weimar edition of Martin Luther's Works, English translation edited by J. Pelikan [Concordia: St. Louis], Vol. 11, Vol. 24, 107
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Martin Luther 214
seminal figure in Protestant Reformation 1483–1546Related quotes
“Mary sheds tears because men call her "The Mother of God."”
Chick tracts, " Why Is Mary Crying? http://www.chick.com/reading/tracts/0040/0040_01.asp" (1987)

Against the Galileans (c. 361) as translated in The Works of the Emperor Julian, http://books.google.com/books?id=ZGliAAAAMAAJ&q=%22But+why+do+you+not+cease+to+call+Mary+the+mother+of+God%22&dq=%22But+why+do+you+not+cease+to+call+Mary+the+mother+of+God%22&lr=&pgis=1 edited by Wilmer Cave Wright, London, W. Heinemann; New York, The Macmillan co., (1913 - 1923), volume 3, p. 399, ISBN 0674990145 ISBN 9780674990142 .
General sources

John Calvin, https://books.google.com/books?isbn=1556352468 Epistle CCC to the French church in London, 27th September 1552; translated by Jules Bonnet, p.362

“I esteem immensely the Mother of God, the ever chaste, immaculate Virgin Mary.”

Calvini Opera, Braunshweig-Berlin, 1863-1900, Volume 45, 348, (1877-78)

The Precious and Sacred Writings of Martin Luther (1905) edited by John Nicholas Lenker; republished as Sermons of Martin Luther (1996), p. 291

Calvin to the Foreigners’ Church in London, 1552-10-27, in George Cornelius Gorham, Gleanings of a few scattered ears, during the period of Reformation in England and of the times immediately succeeding : A.D. 1533 to A.D. 1588 http://books.google.com/books?vid=0bbTMcT6wXFWRHGP&id=esICAAAAQAAJ&printsec=titlepage&dq=%22george+cornelius+gorham%22 (London: Bell and Daldy, 1857), p. 285.

“What good is it having God for a mother if she never sends you a birthday card?”
Source: Only Begotten Daughter (1990), Chapter 3 (p. 50)