The history of "show, don't tell" · 3:26am Mar 17th, 2016
I've collected instances of the advice "show, don't tell" from across time. Here they are, chronologically. I've blogged a couple of them before.
The Wikipedia page on "Show, don't tell" lists some more recent ones. (If you read that page, be aware that while Hemingway was a "show, don't tell" writer, "iceberg theory" is a claim about depth of backstory, not about "show, don't tell".)