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Isocrates: Whetstones are not themselves able to cut, but make iron sharp and capable of…

Whetstones are not themselves able to cut, but make iron sharp and capable of cutting.

In today’s wordsSharpening stones can't cut anything themselves, but they make steel sharp enough to.

IsocratesCommonly attributed
Source
From the book Quoted in Dictionary of Burning Words of Brilliant Writers, compiled by Josiah H. Gilbert, 1895

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