Google Ngram lists the first usage at around 1810 but a later book refers to it as an old saw.
Is there any way to know what the original context of this saying was? I understand that it probably goes along with the idea that actions are stronger than words or that actions are greater than words but I can't verify that.
I am curious where it was first popularized and maybe even the context that lead it to be coined in the first place.
Best Answer
The Facts on File Dictionary of Proverbs has the following (emphasis mine):
Here is the relevant quotation from Haliburton's book, completely titled The Attaché; or, Sam Slick in England, and courtesy of Project Gutenberg:
Haliburton was a novelist, and Sam Slick seems to have been his primary literary foil, much like Hercule Poirot and Tom Ripley became for Agatha Christie and Patricia Highsmith, respectively. From Wikipedia (emphasis mine):
The opening paragraph from a biography of Haliburton, titled Inventing Sam Slick: a biography of Thomas Chandler Haliburton, gives one a clue to Slick's renown:
So our best guess should be that the sentiment talk is cheap spread in its current form as a result of being associated with a long past literary phenomenon in Sam Slick, whose turn of phrase — perhaps even including talk is cheap — seemed to have delighted those over the pond.