What message does Hamlet receive from the Ghost and how does he react to it?

What message does Hamlet receive from the Ghost   and how does he react to it?

The Ghost appears before Hamlet (at night) in Act I, Scene IV when he in company with Horatio and Marcellus criticizes the reckless behavior of the present King, his uncle Claudius. Hamlet asks the apparition excitedly why it has come but it makes no answer. It only beckons Hamlet to follow it off the stage and again enters the stage with Hamlet in the next scene, assuming it is taking him to a remote place. The Ghost identifies itself to Hamlet as his father's spirit forced to wander by night and to suffer purgatorial fires by day until his sins are forgiven.

The Ghost urges Hamlet to avenge his murder and also says that although his sudden death was blamed on a serpent's sting, he, in fact, was murdered by Claudius. The ghost passionately tells Hamlet that his uncle Claudius poured poison into the King's ear as he lay sleeping in the orchard. But while he asks Hamlet to avenge his murder, he tells him to spare his mother because her sense of guilt and heaven will punish her.

Hamlet readily accepts the Ghost as his father's spirit and agrees to avenge his murder even before he hears the details. In a soliloquy Hamlet contemplates over his mother's frailty and Claudius's   nature, and determines not to forget the Ghost's injunction. Hamlet in an overwrought emotional state says that the Ghost's call for revenge has wiped out everything else in his mind. Even when the Ghost is out of sight, his tortured voice still echoes Hamlet's injunction to his friends to take an oath of secrecy at what they have seen, although significantly, Hamlet keeps the Ghost's story to himself.

Hamlet realizes what an enormous burden he has to bear. When the Ghost says, "Let not the royal bed of Denmark be / A couch for luxury and damned incest," it looks as though Hamlet must not only avenge his father's death to redeem his own honor but also perform a public service.

Thus we see that the play's important theme of honor and revenge has been clearly launched by the Ghost's message. The revelation of the Ghost intensifies the horror that Hamlet felt at the Over-hasty marriage of his mother with Claudius. The foul play that Hamlet suspected becomes a reality, and he is charged by the spirit Of his dead father to avenge his father's murder of which he is Incapable.