“There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.”
Book III, Ch. 13
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Source: The Complete Essays
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Michel De Montaigne 264
(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592Related quotes

“Every time man makes a new experiment he always learns more. He cannot learn less.”
1960s, Operating Manual for Spaceship Earth (1963)
Context: Every time man makes a new experiment he always learns more. He cannot learn less. He may learn that what he thought was true was not true. By the elimination of a false premise, his basic capital wealth which in his given lifetime is disembarrassed of further preoccupation with considerations of how to employ a worthless time-consuming hypothesis. Freeing his time for its more effective exploratory investment is to give man increased wealth.

"Coon Tree," The New Yorker (14 June 1956), The Points of My Compass: Letters from the East, the West, the North, the South (1962); reprinted in Essays of E.B. White (1977)

“But when an old man dances,
His locks with age are grey.
But he's a child in mind.”
Odes, XXXIX. (XXXVII), 3.

Source: The Thirteen Books of Euclid's Elements (1908), Ch. 1, p.2