“He seems to have declared war on the King’s English as well as on the English king.”
Source: His Last Bow: 8 Stories
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Arthur Conan Doyle 166
Scottish physician and author 1859–1930Related quotes

Attributed, for example, by http://web.archive.org/20090806185021/www.international.ucla.edu/burkle/article.asp?parentid=2198, which contains a common version of the story, where Ferguson says this while holding a bible and defending her objection to the teaching of Spanish in Texas public schools
According to http://itre.cis.upenn.edu/~myl/languagelog/archives/003084.html, a variation on this quote is reported in the New York Times on May 23, 1881, but no record of Ferguson having said this, or anything like it, could be found
This quote and variations on it are often frequently attributed to others; one story, usually heard outside the United States, has an unnamed "U.S. congressman" saying it in a television interview; for example, see http://ontrapranur.blogspot.com/2008/05/if-english-was-good-enough-for-jesus.html
Misattributed

To Leon Goldensohn (28 May 1946)
The Nuremberg Interviews (2004)

“Oh, when shall English men
With such acts fill a pen,
Or England breed again
Such a King Harry?”
Source: To the Cambro-Britons and Their Harp, his Ballad of Agincourt (1627), Lines 117-120.
Source: A History of the Jews in England (3rd ed. 1964), p. 270

Source: What On Earth Is About To Happen… For Heaven’s Sake? (2013), p. 11

Letter to his admirals (18 August 1336), quoted in Ian Mortimer, The Perfect King: The Life of Edward III, Father of the English Nation (Vintage, 2008), p. 130

http://www.columbia.edu/itc/mealac/pritchett/00generallinks/macaulay/txt_commons_indiagovt_1833.html#13
Attributed