By 1870, Britain’s steam engines generated 4 million horsepower, equivalent to the work of 40 million men, who—if industry had still depended on muscles—would have eaten more than three times Britain’s entire wheat output.

Meaning: Another worker can often find something to improve in work already considered finished. The second barber’s remaining task suggests that completion depends on standards and perspective, without proving that earlier work was careless or endless correction is necessary.

Meaning: People working in the same trade may compete or disagree despite their shared occupation. The proverb highlights rivalry among peers, without establishing that cooperation is rare or that professional differences are personal hostility.