Being quiet allows you to listen to things you might normally miss - a child with a story to tell, a friend with a heavy heart, God whispering your name.
Being quiet leaves fewer opportunities to be misunderstood, less need to explain what you actually meant.
Being quiet slows your pace - the pace of your racing mind, your pounding heart.
Being quiet gives you more time to be reflective and observe what's going on around you instead of always needing to say something about it.
Being quiet lets you be still.