Paper money (n.) is gold money sublimated: first worn coin, then small change, finally a worthless slip that is a mere sign of value.
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Paper money (n.) is a scrap that stays money only so long as the owners of commodities go on agreeing that it is.
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Paper money (n.) stands the laws of gold on their heads: gold circulates because it has value, paper has value because it circulates.
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Paper money (n.) is money of the society; gold and silver are money of the world.
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Paper money (n.) gives the monetary existence of commodities a purely social existence — salvation by faith alone.