Jesus warns us against anger, and reminds us to find a better way to resolve our conflicts. It is impossible to avoid confrontations and conflict, but we should never let anger poison our relationships or lead to damage that is impossible to undo. It reminds me of a traditional Irish poem:

There once were two cats of Kilkenny,
Each thought there was one cat too many;
So they fought and they fit,
And they scratched and they bit,
Till, excepting their nails,
And the tips of their tails,
Instead of two cats there weren’t any.

When anger takes over, irrational actions can lead to self-destruction and harm to others. While the cats of Kilkenny might not be unable to control their animal nature, Jesus reminds us we certainly can.