In The Crucible, certainty can be dangerous as demonstrated by the character of Abigail.
She accused Proctor's wife of being a witch. She testified that she saw the spirit of Proctor's wife and it stabbed her. Even though she lied, her certainty in front of the jury and the towns people convince them that what she said is true and that Proctor's wife is a witch that must be burned to death.
The next soliloquy Hamlet has after seeing the ghost of his father is in Act II, Scene ii after the players, Rosencrantz and Guildenstern, have left him alone. In this soliloquy ("what a rogue and peasant slave am I"), Hamlet expresses his frustration with the fact that the actor could create tears in an instant about a fictional character, but he has lost his actual father and cannot even do anything about it. Through this he also decides on the plan to try and catch Claudius' guilt.
Because Hrothgar did a favor for his father and he felt like he owed him and he is also is show-off .
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