Statistics for occurrence #1 of “Mr. Jackson” in chapter 1 of Historic leaves, volume 2, April, 1903 - January, 1904:

... man whose coal Is safely in the bin. On second thoughts, when from the pole Come blasts that chill us through, Then happy is the man whose coal Is in and paid for, too. Not infrequently Mr. Jackson uttered a wise maxim in the midst of his jokes, as: The man who always says what he thinks should think well what he says. Again, The man who knows that he doesn't know everything, knows something....
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