Final answer:
The lines reflect Macbeth's realization that he is too deeply involved in violence and wrongdoing to stop, indicating his continued commitment to power at any cost and his feeling of being entrapped by his actions.
Step-by-step explanation:
The lines you are referring to are from William Shakespeare's play, Macbeth. They express Macbeth's realization that he has committed atrocities that cannot be undone and that he has no option but to continue on this path of violence and power at any cost. By saying, "By the worst means the worst," he acknowledges the severity of his actions. "For mine own good," suggests that he believes his actions are necessary for his personal benefit, despite the immorality involved. "All causes shall give way" implies that any justification can be overridden for his ambition. The metaphor, "I am in blood Stepped in so far, that should I wade no more Returning were as tedious as go'er," illustrates that Macbeth has been involved in so much killing that retreating is as difficult as continuing his violent path. This metaphor is significant because it encapsulates Macbeth's descent into tyranny and his feeling of being trapped by his own deeds.