And the quoted person stated ---- The specific quote you mention, from a letter to Sunderland dated 10th April 1979, is accurate as far as it goes.
What do you now claim?
That's pretty much the definition of a quote out of contxt. The question is, does it represent the author's intentions, or is it part of a setup to a wider argument.
It is possible to excerpt text without misrepresenting the author, but in this case the excerpted quote misrepresents the author's intentions.