Final answer:
The lines provided are from 'Macbeth' and not 'Romeo and Juliet', and they convey Macbeth's resolve and trepidation as he approaches the moment of Duncan's murder. The hallucination of a bloody dagger signifies his impending violent act.
Step-by-step explanation:
The passage referenced, 'Thou marshall'st me the way that I was going; And such an instrument I was to use. Mine eyes are made the fools o' the other senses, Or else worth all the rest; I see thee still, And on thy blade and dudgeon gouts of blood,' is from Shakespeare's play Macbeth, not Romeo and Juliet. The lines are spoken by Macbeth in Act 2, Scene 1, as he hallucinates a bloody dagger leading him towards Duncan's chamber where he will commit murder. Juliet does not speak these lines, so it appears there is a mix-up in the question. Macbeth is expressing his resolve to follow through with the killing, as the imaginary dagger points the way. The vision of the dagger with blood symbolizes the bloody act he is about to undertake, and he reflects on the senses being deceived or overwhelmed by the sight. The mention of 'halfworld' and 'wicked dreams' signifies the night and the evil actions that thrive in darkness, while the 'bell' that 'invites' him symbolizes the sign for him to commence his treacherous deed.