"Just as iron sharpens iron, a person sharpens the character of his friend."
When sharpening a knife, there must be enough friction to cause the blade to change in the right way to yield a sharp edge.
When we can civilly discuss issues with others of opposing viewpoints, we become sharper minded, improve our skills at discourse, and help others do the same.
When sharpening a knife, if the friction is not applied in the correct direction, there will be a dulling effect, rendering the blade ineffective.
If the only interactions we have with others of opposing views are arguments filled with insults and inflamed emotions, we are robbing ourselves of the ability to improve our communication skills. We do not learn to disagree agreeably.
Softened butter does nothing to sharpen the blade of a knife.
When we stay within our safe bubble, only discussing or sharing ideas with people of the same mindset, we limit our understanding. We limit our growth in interaction and communication with other human beings.
Are we sharpening or dulling those around us?
Are we allowing ourselves to grow and improve or are we content to remain limited?