Answer:
This murderous shaft that's shot / Hath not yet lighted, and our safest way / Is to avoid the aim.
Explanation:
William Shakespeare's tragedy play "Hamlet" tells the story of a one man's greed for power which led him to kill anyone who's deemed an obstacle for his attaining of the throne. Hamlet may have been a good man before but the prophecy of the three witches had made him single minded for his own greed.
The characters of Malcolm and Donalbain are the sons of the slain King Duncan. Scared that they might be the next target, for they were princes, they decided to flee to Ireland and England separately.
The excerpt in the question is from Act II scene iii of the play where the brothers had decided at once to flee from the country. Malcolm suggested that they go out before anything happen to them, for though they hadn't encountered the danger, they should try to avoid it as soon as they can. Their decision can be seen in the lines "This murderous shaft that's shot / Hath not yet lighted, and our safest way / Is to avoid the aim", for they believe that even their lives may be in danger for being heirs to the throne.
