Ghost to Hamlet: Everyone was told that a poisonous snake bit me when I was sleeping in the orchard. But in fact, that’s a lie that’s fooled everyone in Denmark. You should know, my noble son, the real snake that stung your father is now wearing his crown. (1.5.33-38) The ghost appears in the wake of the king's death. Hamlet's precarious mental state sets up the story.
Hamlet: You’re everywhere, aren’t you? Maybe we should move. Come over here, gentlemen, and put your hands on my sword again. Swear by my sword you’ll never mention what you’ve heard. (1.5.158-162) Hamlet addresses the men to ensure that the mission of the ghost remains a secret until Hamlet can resolve his conflict by proving the truth.
Hamlet: I’ve heard that guilty people watching a play have been so affected by the artistry of the scene that they are driven to confess their crimes out loud. (2.2.551-554) Hamlet decides to try to use the actors in order to convict Claudius.
Hamlet: You low-life, nosy, busybody fool, goodbye. I thought you were somebody more important. You’ve gotten what you deserve. Hamlet to Polonius’s corpse (3.4.32-34) Hamlet speaks to Polonius after striking his sword through the curtain. He intended to kill Claudius after his prayer.
Gertrude: [Ofelia] fell in the weeping brook. Her clothes spread side, and mermaidlike. (4.7.72-73) Gertrude reveals the death of Ofelia to Laertes. The tragedy of the story begins to complete.
Laertes: He got what he deserved. He mixed that poison himself. Please forgive me as I forgive you. (5.2.323-326) Laertes uses his dying breath to reach out to Hamlet for forgiveness, as Claudius and Hamlet also die.