The author explicitly says that spirit can be found in the voice of a character.
Explicitly means directly - so it means that the author didn't hide the fact that he knew what could be found in the voice.
Here is what he says:
<em>That is wholly appropriate, for in the breath—the voice—of a character lies its essential spirit.</em>
So the correct answer is definitely spirit.
How does Juliet show her maturity and independence in this scene? Juliet shows her maturity in this scene by taking the potion so she can see Romeo. If the Potion does not work, what will Juliet do? If the potion does not work Juliet will kill herself.
Well he described them a brave new explorers who feared nothing on there dangerous journey