
“Those who can't do, teach. And those who can't teach, teach gym.”
Source: Annie Hall: Screenplay
This and many similar quotes with the same general meaning are misattributed to Aristotle as a result of Twitter attribution decay. The original source of the quote remains anonymous. The oldest reference resides in the works of George Bernard Shaw, Man and Superman (1903): "Maxims for Revolutionists", where he claims that “He who can, does. He who cannot, teaches.”. However, the related quote, "Those who can, do. Those who understand, teach" likely originates from Lee Shulman in his explanation of Aristotlean views on professional mastery: Source: Shulman, L. S. (1986). Those who understand: Knowledge growth in teaching. Educational Researcher, 15(2), 4 - 14. Stable URL: http://www.jstor.org/stable/1175860
Misattributed
Variant: Those who can, do, those who cannot, teach.
“Those who can't do, teach. And those who can't teach, teach gym.”
Source: Annie Hall: Screenplay
“Those who can -- do. Those who can't -- teach.”
“Those who can kill themselves do, and those who can’t, teach philosophy.”
Source: The Philosopher's Apprentice (2008), Chapter 13 (p. 295)
Source: A Sincere Admonition to All Christians to Guard Against Insurrection and Rebellion (1522), p. 65
“The authority of those who teach is often an obstacle to those who want to learn.”
Section 6 : Higher Life
Founding Address (1876), Life and Destiny (1913)
Context: There is a difficulty in the way of teaching the higher life, due to the fact that only those who have begun to lead it can understand the meaning of it. Nevertheless, all men can be induced to begin to lead it. Though they seem blind, their eyes can be opened so as to see. Deep down in every human heart is the seed of a diviner life, which only needs the quickening influence of right conditions to germinate.
“Silence is the best answer for those who do not want to understand.”
Original: (it) Il silenzio è la miglior risposta a chi non vuol capire.
Source: prevale.net