Nicomachus of Gerasa: Introduction to Arithmetic (1926)
“Socrates: Shall we set down astronomy among the objects of study? Glaucon: I think so, to know something about the seasons, the months and the years is of use for military purposes, as well as for agriculture and for navigation. Socrates: It amuses me to see how afraid you are, lest the common herd of people should accuse you of recommending useless studies.”
Socrates as quoted by Plato. In Richard Garnett, Léon Vallée, Alois Brandl (eds.), The Universal Anthology: A Collection of the Best Literature (1899), Vol. 4, 111.
Attributed
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Socrates 168
classical Greek Athenian philosopher -470–-399 BCRelated quotes
“Study carefully, the character of the one you recommend, lest their misconduct bring you shame.”
from Horace, Epistles I.xviii.76
Misattributed
Letter to Darrel Abercrombie in 1987, quoted at Free Malaysia Today http://www.freemalaysiatoday.com/category/opinion/2013/04/19/a-tale-of-two-ms-mahathir-and-margaret/
Source: Presocratic Philosophy: A Very Short Introduction (2004), Introduction
As quoted in "Real talk with Bill Maher" by Joan Walsh at Salon.com (16 February 2007) http://www.salon.com/ent/tv/int/2007/02/16/maher/index2.html
A Better Hope for the Soul, The Watchtower magazine, 8/1 1996.
Source: Computer Science as Empirical Inquiry: Symbols and Search (1975), pp. 120-121.