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At surface level, the adage emphasizes the consistency that arises when information comes from a single source and points out the potential pitfalls of having too much conflicting information. However, the underlying message is to question the apparent certainty of anyone who only has one source of
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The saying was coined by the San Diego Union on
September 20, 1930: "Confusion.—Retail jewelers assert that every man should carry two watches. But a man with one watch knows what time it is, and a man with two watches could never be sure." Later this was — mistakenly — attributed to Lee Segall of
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151:Farmer, Dan; Wietse Venema (2006). "2".
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62:List of chronometers on HMS
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101:(2003).
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