“Vast is the field of Science … the more a man knows, the more he will find he has to know.”
Vol. 1, letter 11.
Sir Charles Grandison (1753–1754)
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Samuel Richardson 21
English writer and printer 1689–1761Related quotes

“The more a man knows, the more he forgives.”
Widely attributed to Catherine II online, this has been attributed to Confucius in published books, but no print sources attribute this to Catherine.
Misattributed

“The more man learned, the more he realized he did not know.”
Source: The Lost Symbol

“Man knows much more than he understands.”
As quoted in A Primer of Adlerian Psychology: The Analytic-Behavioural-Cognitive Psychology of Alfred Adler (1999) by Harold H. Mosak and Michael P. Maniacci

“If a man knows more than others, he becomes lonely.”
“Socialism is founded on a lie -- the premise that man knows more than he in fact does know.”
Leonard Read Journals, September 18, 1959 https://history.fee.org/leonard-read-journal/1959/leonard-e-read-journal-september-1959

“An intellectual is a man who takes more words than necessary to tell more than he knows.”
“Qui plussait, plus se tait. French, you know. The more a man knows, the less he talks.”
Source: A Wrinkle in Time

A jibe directed at Ramsay MacDonald, during a speech in the House of Commons, March 23, 1933 "European Situation" http://hansard.millbanksystems.com/commons/1933/mar/23/european-situation#column_544. This quote is similar to a remark (“He can compress the most words into the smallest ideas of any man I ever met”) made by Abraham Lincoln. [Frederick Trevor Hill credits Lincoln with this remark in Lincoln the Lawyer (1906), adding that ‘History has considerately sheltered the identity of the victim’.]
The 1930s