If you take careful notice in everyday life, you will find that sometimes before a person has finished his sentence you have become annoyed. It is not because of what he has said, but it is his voice. And you will also notice -- perhaps not every day in your life, but sometimes -- that you once heard someone say something that has always remained with you: it gives always a beautiful feeling, it is always soothing, it is healing, it is uplifting, it is inspiring.