I matter.

Mattering is easiest to see by subtraction, which is an unpleasant way to check and also the most reliable. Think about the Tuesday you were off sick and the small chaos that followed — the thing nobody else knew how to do, the person who noticed the room was quieter.

None of this gets said out loud during normal operation. Being relied on is largely silent, and being missed only becomes audible when you are not there to hear it.