Your own Voice
Language not only is how we communicate with others, it is also key to how we change ourselves through our affirmations, assertions with both our internal voice as well as our external voice. Every word we speak is special. The sound comes out our mouths while also resonating within ourselves and at the same time goes in our own ears as well as those around us.
What we say to ourselves or say to others (in the presence of ourselves) has a far greater impact than simply listening to another.