“It may be expecting too much to expect most intellectuals to have common sense, when their whole life is based on their being uncommon -- that is, saying things that are different from what everyone else is saying. There is only so much genuine originality in anyone. After that, being uncommon means indulging in pointless eccentricities or clever attempts to mock or shock.”
Random Thought
2000s, Ever Wonder Why? and Other Controversial Essays (2006)
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Thomas Sowell 101
American economist, social theorist, political philosopher … 1930Related quotes

“One should use common words to say uncommon things”

“Common sense in an uncommon degree is what the world calls wisdom.”
Source: Literary Remains, Vol. 1

“There is nothing more uncommon than common sense.”
Anonymous saying, dating back at least to its citation in Natural Theology (1836) by Thomas Chalmers, Bk. II, Ch. III : On the Strength of the Evidences for a God in the Phenomena of Visible and External Nature, § 15, where the author states: "It has been said that there is nothing more uncommon than common sense."; it has since become misattributed to particular people, including Frank Lloyd Wright.
Misattributed

From an article originally published in the February 6, 1949 issue of "This Week" Magazine, from "Addresses Upon the American Road,Volume: Volume 8: 1955-1960." Developed in speech entitled "Moral and Spiritual Recovery from War" presented October 13, 1945, at 75th Anniversary of Wilson College at Chambersburg, Pennsylvania. "The Crusade Years, 1933–1955: Herbert Hoover's Lost Memoir of the New Deal Era and Its Aftermath", edited by George Nash
The Uncommon Man

“Excellence is to do a common thing in an uncommon way.”

“Excellence is doing a common thing in an uncommon way.”
“It has been said that there is nothing more uncommon than common sense.”
Natural Theology (1836), Bk. II, Ch. III : On the Strength of the Evidences for a God in the Phenomena of Visible and External Nature, § 15; though provided without attribution of author, the saying "There is nothing more uncommon than common sense" has since become misattributed to particular people, including Frank Lloyd Wright.

Source: The Conflict of the Individual and the Mass in the Modern World (1932), p. 9