"Those who can't, teach." origin

[Bob]

I didn't know this.


https://blog.4tests.com/can-teach-fair/
"In 1903, George Bernard Shaw dropped his now famous four-act drama Man and Superman. This play was the first instance of that much-maligned, oft-paraphrased quote:

Bob: I’m so discouraged. My writing teacher told me my novel is hopeless.

Jane: Don’t listen to her, Bob. Remember: those who can, do; those who can’t, teach."






https://idioms.thefreedictionary.com/Those+who+can%2C+do%3B+those+who+can%27t%2C+teach



https://en.wikiquote.org/wiki/Man_and_Superman

https://en.wikipedia.org/wiki/Man_and_Superman