
“Those who can -- do. Those who can't -- teach.”
Post the Linux Kernel Mailing List, 2003-09-23, Torvalds, Linus, 2007-06-26, http://web.archive.org/20050226095919/kerneltrap.org/node/901, 2005-02-26 http://kerneltrap.org/node/901,
Torvalds did not originate this quote http://shlomif.livejournal.com/39215.html, and there are earlier records for it. This is a variation on "He who can, does. He who cannot, teaches," which is also attributed to George Bernard Shaw.
2000s, 2000-04
“Those who can -- do. Those who can't -- teach.”
“Nobody can tell what I suffer! But it is always so. Those who do not complain are never pitied.”
Source: Pride and Prejudice
“Those who can't do, teach. And those who can't teach, teach gym.”
Source: Annie Hall: Screenplay
“Those who say it can't be done are usually interrupted by others doing it.”
“Whatever you do, make sure that you have those things that money can't buy”
“Those who can kill themselves do, and those who can’t, teach philosophy.”
Source: The Philosopher's Apprentice (2008), Chapter 13 (p. 295)
“It is those who can see the invisible that can do the impossible.”
Source: Life, the Truth, and Being Free (2010), p. 93