
Nicomachus of Gerasa: Introduction to Arithmetic (1926)
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
Nicomachus of Gerasa: Introduction to Arithmetic (1926)
“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.