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.

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Quote text and notes from Wikiquote: P. T. Barnum (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.