Your nervous system hears everything

Light.
Tone of voice.
Speed.
Ambient tension.
Rhythm.
Pressure.
Space.
Temperature.

Your body constantly registers signals of safety or threat.

Long before you are conscious of what is happening.

That is why a space can relax you without you knowing why. And a person can tense you up before they even open their mouth.

The nervous system does not wait for you to think.

It reads the environment and responds.

All the time.