John Stuart Mill? Henry George? Herbert Vincent Mills? Apocryphal?

Question for Quote Investigator: Numerous labor-saving machines were designed and built in the nineteenth century, but a prominent political economist was unimpressed. He doubted whether these inventions had lessened the toil of anyone by even a single day.
This notion has been attributed to John Stuart Mill, but I do not recall the precise phrasing. Would you please help me to find a citation?
Reply from Quote Investigator: In 1848 John Stuart Mill published “Principles of Political Economy with Some of Their Applications to Social Philosophy”. Mill did not believe that machines had improved the quality of life of workers in the past, but he expressed hope that they could be beneficial in the future. Boldface added to excerpt by QI:1
Hitherto it is questionable if all the mechanical inventions yet made have lightened the day’s toil of any human being. They have enabled a greater population to live the same life of drudgery and imprisonment, and an increased number of manufacturers and others to make large fortunes. They have increased the comforts of the middle classes. But they have not yet begun to effect those great changes in human destiny, which it is in their nature and in their futurity to accomplish.
Mill has received credit for a wide variety of different phrasings for this idea. Below is an overview with dates and attributions.
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