It helps us to see them in their true light and makes us more earnest in our efforts to get away from them altogether.
I was once a guest at a large reception and the noise of talking seemed to be a roar, when suddenly an elderly man got up on a chair and called "silence," and having obtained silence he said, "it has been suggested that every one in this room should speak in a lower tone of voice." The response was immediate.

Every one went on talking with the same interest only in a lower tone of voice with a result that was both delightful and soothing.
I say every one--there were perhaps half a dozen whom I observed who looked and I have no doubt said "how impudent." So it was "impudent" if you chose to take it so--but most of the people did not choose to take it so and so brought a more quiet atmosphere and a happy change of tone.
Theophile Gautier said that the voice was nearer the soul than any other expressive part of us.

It is certainly a very striking indicator of the state of the soul.

If we accustom ourselves to listen to the voices of those about us we detect more and more clearly various qualities of the man or the woman in the voice, and if we grow sensitive to the strain in our own voices and drop it at once when it is perceived, we feel a proportionate gain.
I knew of a blind doctor who habitually told character by the tone of the voice, and men and women often went to him to have their characters described as one would go to a palmist.
Once a woman spoke to him earnestly for that purpose and he replied, "Madam, your voice has been so much cultivated that there is nothing of you in it--I cannot tell your real character at all." The only way to cultivate a voice is to open it to its best possibilities--not to teach its owner to pose or to imitate a beautiful tone until it has acquired the beautiful tone habit.

Such tones are always artificial and the unreality in them can be easily detected by a quick ear.
Most great singers are arrant hypocrites.