Proverbs 27:17 - As iron sharpens iron...

As iron sharpens iron, so one man sharpens another.

It takes iron to sharpen iron. Sharpening a knife requires iron at least as hard as the knife. Once sharpened, a knife is bright, sharp, and ready for much more productive service.

Source: http://www.letgodbetrue.com/proverbs/27_17.htm

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