It’s hard to know what people are thinking and how they’re feeling.  

How can you attempt to learn what’s going on in someone’s internal state?

Here’s a tip: mute what people are saying, and watch what they’re doing.

That chatty guy with the shaking foot?  Probably someone who’s feeling uncomfortable and anxious.

The quiet woman whose eyes are stable and movements are graceful?  Probably someone’s whose thinking is calm and reflective.

Stop listening to sounds, and start looking at actions.  People primarily communicate with their body language.