Why is voice important?

I think voice is important because if you don't use voice it is too boring for the audience or the reader.Think of it like this,if you read a book that had no voice, you'd practicly fall asleep.Or if you were reading a script, you'd yawn and loose interest. If you were listening to a play with no voice, you wouldn'like it,would you?That is why I think voice is important.

Brooks