The proverb expresses the gain of mutual counsel as found in clear, well-defined thoughts. Two minds, thus acting on each other, become more acute.…

So a man sharpens the countenance of his friend — i.e., the play of wit with wit sharpens and brightens up the f…

For this reason, Christian association is useful, and for this reason also, sinful company is evil, for one sinner sharpens another to do evil, jus…

Iron sharpens iron. A sword or knife made of iron is sharpened by it; so butchers sharpen their knives; so a …

We are cautioned to be careful whom we converse with. And directed to aim, in conversation, to make one another wiser and better.