Most every character in Hamlet, perhaps with the exception of Ophelia, exhibits some form of deception. This is most obvious in Hamlet himself and in Claudius. Hamlet deliberately feigns madness when in the presence of Claudius and other members of the royal court. He even goes so far as to lambast Ophelia, his true love, in act 3, scene 1, denying the fact that he ever loved her (which is untrue, as I interpret it) and suggesting that she enter a nunnery. A conversation between them proceeds as follows:
Hamlet: You should not have believed me, for virtue cannot so (inoculate) our old stock but we shall relish of it. I loved you not.
Ophelia: I was the more deceived.
Hamlet: Get thee to a nunnery. Why wouldst thou be a breeder of sinners?
It is a cruel comment to a woman he does love, but Hamlet must maintain the ruse of insanity so as to not arouse suspicion to his true intentions: to kill Claudius.
Claudius very obviously also practices deception: his rise to power is based on a lie. Though he...
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