In Shakespeare's play "Hamlet," the eponymous character is very concerned with the performance of a play within the play, in which a group of actors are to reenact the murder of Hamlet's father. Hamlet provides the actors with a script that he has revised, and he insists that the lines be delivered exactly as he has written them. There are several reasons why this is so important to Hamlet.
Firstly, Hamlet wants to use the play to confirm his suspicions about his uncle, who he believes has murdered his father and taken the throne. By having the actors perform a version of the murder that matches his own understanding of the crime, he hopes to elicit a guilty reaction from his uncle, thereby confirming his guilt.
Secondly, Hamlet is a character who is obsessed with the power of language and the ability of words to shape reality. By controlling the words that the actors speak, he is attempting to control the narrative of his own life and the events that have led to his current situation.
Finally, Hamlet's insistence on the precise delivery of the lines also speaks to his perfectionism and his desire for things to be done exactly right. This is a character trait that is seen throughout the play, as Hamlet struggles with indecision and a desire for everything to be perfect, even in the midst of chaos and tragedy.
Overall, the importance that Hamlet places on the delivery of the lines in the play within the play is a reflection of his complex character and his desire to control the narrative of his own life.