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Some Googling turns up that it may be a biblical reference. See, for example, the last paragraph here: https://books.google.com/books?id=3YgiAwAAQBAJ&pg=PA183
I'm not sure exactly what book/chapter/verse it refers to, though. You could try swimming through these results: https://www.google.com/search?q=%22mere%20men%22%20site%3Abiblegateway.com