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Henry Wadsworth Longfellow: Perseverance is a great element of success. If you only knock long enough and…

Perseverance is a great element of success. If you only knock long enough and loud enough at the gate, you are sure to wake up somebody.
Henry Wadsworth LongfellowSourced
Source
From the book Final Memorials of Henry Wadsworth Longfellow (Boston, Henry Wadsworth Longfellow, Final Memorials of Henry Wadsworth Longfellow (Boston, Ticknor and company: 1887), p. 373 (Ch. XIX. Table-talk.)

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