“We can teach no virtues we do not practice," occurred to me this afternoon; for without learning by experience how a virtue is acquired, how can we teach any one to acquire it? I thought of this in connection with the experience of undutiful children. By the working of this natural cause, they will not make their own children dutiful. Read in Luke of the angel which appeared to Christ in Gethsemane, strengthening Him. We all see this angel when we say truly, "Thy will, not mine, be done.”
22 August 1875.
The Walk With God (1919)
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Julia Ward Howe 40
American abolitionist, social activist, and poet 1819–1910Related quotes

Il n'y a que l'expérience ou l'exemple qui puisse déterminer raisonnablement le penchant du cœur. Or l'expérience n'est point un avantage qu'il soit libre à tout le monde de se donner; elle dépend des situations différentes où l'on se trouve placé par la fortune. Il ne reste donc que l'exemple qui puisse servir de règle à quantité de personnes dans l'exercice de la vertu.
Avis de l'auteur, p. 32; translation pp. 4-5.
L'Histoire du chevalier des Grieux et de Manon Lescaut (1731)

"I shit on all the revolutionary vanguards of this planet" http://www.csuchico.edu/zapatist/HTML/Archive/Communiques/etaJAN.html January, 2003

1920s, Viereck interview (1929)

“We prepare for success by acquiring virtues.”
Source: Doing Virtuous Business (Thomas Nelson, 2011), p. 20.

Quoted in Salazar: biographical study - page 285; of Franco Nogueira - Published by Atlantis Publishing, 1977