William Blake makes the quoted statement
Date (happened)
c. 1768
relative · possible · preferred
Source
passage 555255: 'Two hundred years ago Blake made the statement'
Reasoning
The reviewed delivery stands at 1968-09-09, and Neville gives only a rounded two-hundred-year interval. Circa 1768 possible preserves that rough recollection without asserting a publication date.
Told / reported
9 September 1968
estimated
Source
reviewed surviving delivery date on nid 2191
Reasoning
Passage 555255 belongs to nid 2191, whose L7-reviewed standing date is 1968-09-09 certain; refuted 1966 claims are excluded.