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The poor man sweeps his floor until it is spotless. The poor woman combs her hair until it is neat and tidy. Neither produces a wonderful sight, but these actions bespeak a sensibility of elegance.
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An unruly horse can still be ridden after taming. Melted metals from the smelting furnace are returned to the mould.
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To constantly hear words that grate upon the ear and to always encounter matters that unsettle the heart—this is the whetstone for cultivating virtue.