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P. T. Barnum: Many a man acquires a fortune by doing his business thoroughly, while his…

Many a man acquires a fortune by doing his business thoroughly, while his neighbour remains poor for life, because he only half does it. Ambition, energy, industry, perseverance, are indispensable requisites for success in business.
P. T. BarnumCommonly attributed
Source
From the book 'Whatever You Do, Do With All Your Might', The Art of Money-Getting., P. T. Barnum, 'Whatever You Do, Do With All Your Might', The Art of Money-Getting.

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