“A man is as old as his arteries, and as young as his ideas.”
Will Durant (1885–1981) American historian, philosopher and writer
Source: Fallen Leaves (2014), Ch. 4 : On Old Age
“It is terrible to see how a single unclear idea, a single formula without meaning, lurking in a young man’s head, will sometimes act like an obstruction … in an artery, hindering the nutrition of the brain, and condemning its victim to pine away in the fullness of his intellectual vigor and in the midst of intellectual plenty.”
"How to make our ideas clear,” Popular Science Monthly, Vol. 12 (January 1878)
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Charles Sanders Peirce121
American philosopher, logician, mathematician, and scientist 1839–1914Related quotes
“I can't see how a single man could spend his time to better advantage than in the Marines.”
Daniel Daly (1873–1937) United States Marine Corps Medal of Honor recipient
1919
Who's Who in Marine Corps History: "Daniel Daly"
Adlai Stevenson (1900–1965) mid-20th-century Governor of Illinois and Ambassador to the UN
Speech to the United Parents Association, as quoted in The New York Times (6 April 1958)
“The telephone book is full of facts, but it doesn't contain a single idea.”
Mortimer J. Adler (1902–2001) American philosopher and educator
Source: Connie Robertson (1998). Book of Humorous Quotations. p. 2
William McFee (1881–1966) American writer
Harbours of Memory (1921), p. 236
Paraphrased variant: A man must let his ideas grow, not be continually rooting them up to see how they are getting on.
“Man cannot live in the midst of plenty.”
Thomas Robert Malthus (1766–1834) British political economist
Source: An Essay on The Principle of Population (First Edition 1798, unrevised), Chapter X, paragraph 7, line 1