Sharpened as if by Iron Diamonds are the hardest naturally occurring substance on earth. Hence, it takes one diamond to cut another. This may remind Bible students of the proverb that says: “By iron, iron itself is sharpened. So one man sharpens the face of another.” (Proverbs 27:17) How is a person’s face “sharpened”? One individual may succeed in sharpening the intellectual and spiritual state of another, just as a piece of iron can be used to sharpen a blade made of the same metal.
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