In James 3, God repeats the classic parental command and makes it very clear that He’s serious. Yes, He says here that no one can tame the tongue, but the context of the chapter makes it clear that He expects us to try.
Luke 6:45 tells us that what comes out of our mouths reveals what is really in our hearts. We can say it isn’t so, but where else would the words come from?
If I’m truly walking in the 1 Corinthians 13 kind of love that God desires from me, if that’s what fills my heart, then the words that come out of my mouth will be words of love. I won’t be calling another driver an idiot (or worse). I won’t be bad mouthing the mother who isn’t controlling her screaming child.
I won’t be, as James puts it, cursing a person who was made in God’s very image. And, whether we want to admit it or not, EVERY man was made in God’s very image, even the one whose views don’t correspond with our own.
If I do catch my mouth saying things it shouldn’t (or my fingers typing things they ought not) it’s time for a heart check.