Our Voice is a major component of our Self Concept
You can imagine where the students (who are predominantly women) would be sitting if Tom Cruise were teaching the course. My wife would even come to class!
Another major passport is our voice. If I had a very high pitched squeaky voice, it would be hard to win acceptance as a leader of men. I doubt if I could ever be elected president.
We are subconsciously aware of these passports, and as a result show major concern for things that diminish them.
How we hate to have warts and wrinkles on our face; or an aberration to our voice quality and/or articulation.
The significance of our voice to ourselves: One of our most singularly important possessions is our self concept. As part of this, we are obviously very fond of our body parts and feel great loss, over and above the inconvenience, when one of them is amputated.
One of the most important body parts, ironically, is not strictly a body part at all--the voice.