Karl Marx "Last Words"

[Shapiro, Fred]

Karl Marx's "last words" are often said to have been "Last words are for fools who haven't said enough."  In a little quick research I see that the earliest occurrence in Google Books seems to be from a 1971 book.  Can anyone push back the first occurrence earlier than this?  I have not looked in any biographies of Marx.

Fred Shapiro
Editor
YALE BOOK OF QUOTATIONS (Yale University Press)

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