What is juliet's famous exiting line?
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This is the famous exiting line translated to modern language:
yes, noise? Then I'll be brief. O happy dagger! This is you casing. [stabs herself] Rest there, and let me die.
The main purpose of killing herself with the dagger is that Romeo was dead and that give a big mental blow to her mind. She was overwhelmed with emotions and she could no longer take it to anymore. So as to relieve herself from the pain, she killed himself to rise to heaven to see her dead husband, Romeo