The faces you make while someone talks are a reply too.

You are answering even when you say nothing. The flicker of boredom, the eyes going to the door, the small nod that means go on: people read all of it and mostly read it correctly, which is why somebody can tell they are losing you before you have said a word. Half of listening is visible.

The next time somebody is telling you something that matters to them, pay attention to your own face. Put the phone out of reach so your eyes are not pulled sideways, and let what you feel show. It is the cheapest kindness there is, and almost nobody notices when they stop.