“Calvin Coolidge was the greatest man who ever came out of Plymouth Corner, Vermont.”

My Turn at Bat : The Story of My Life (1970), p. 7
Variant: All I want out of life is that when I walk down the street folks will say, "There goes the greatest hitter that ever lived".

Quoted in Memoir of William Wilberforce, Thomas Price (Boston: Light & Stearns, 1836), pages 59–60. https://ia902609.us.archive.org/5/items/memoirwilliamwi00pricgoog/memoirwilliamwi00pricgoog.pdf
Slave Trade Bill speech (1807)

Education (1902)
Context: He who knows naught of dreaming can, likewise, never attain the heights of power and possibility in persuading the mind to act.
He who dreams not creates not.
For vapor must arise in the air before the rain can fall.
The greatest man of action is he who is the greatest, and a life-long, dreamer. For in him the dreamer is fortified against destruction by a far-seeing eye, a virile mind, a strong will, a robust courage.
And so has perished the kindly dreamer — on the cross or in the garret.
A democracy should not let its dreamers perish. They are its life, its guaranty against decay.
Thus would I expand the sympathies of youth.
Thus would I liberate and discipline all the constructive faculties of the mind and encourage true insight, true expression, real individuality.
Thus would I concentrate the powers of will.
Thus would I shape character.
Thus would I make good citizens.
And thus would I lay the foundations for a generation of real architects — real, because true, men, and dreamers in action.

Hannity's America (6 June 2008) http://www.colbertnation.com/the-colbert-report-videos/174546/june-19-2008/sean-hannity-loves-america

"History of My Life" Chapter 17
Referenced

Dead Certainties (Unwarranted Speculations) p. 320 (1991)

Source: The Restaurant at the End of the Universe

As quoted on the official website http://www.rbwm.gov.uk/web/libraries_local_history_figures.htm#William_Herschel of the Royal Borough of Windsor and Maidenhead.