Iron sharpens iron. This is stated in relation to fellowship among friends. The process of sharpening involves removing a veneer from the blade to be sharper. It’s more about deduction of self, grinding down toward sharpness.
If we can discuss for the purpose of honing our view to a more balanced view, as opposed to simply to persuade, we are improved from the interaction. It’s our choice to allow others to help us actually improve.
“Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.” Proverbs 27:17