Three keys to personal liberation that Shakespeare didn't get.

1. Escaping from the Ghost.

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The ghost of Hamlet’s father appears before his son, in Laurence Olivier’s 1948 movie ‘Hamlet’.

Hamlet's unquestioning obedience to the ghost of his father is symbolic. It shows how we are supposed to behave, if we wish to be accepted as good sons and daughters.
By extension, the author shows how this evolves into our need, as adults, to fit into society and be acknowledged as worthy citizens. Basically, we are still looking for approval from our parents.
Morality, in the form of trying to live up to the expectations of other people, becomes our inner policeman, controlling our behaviour and giving society a convenient way to enslave and manipulate us.
This is why, in chapters 12 and 24, Shakespeare's use of the ghost is closely examined and challenged. The function of fathers and mothers as moral educators is spelled out, and the antidote – the art of rebelling against all forms of social morality – is explained.
Meanwhile, Hamlet is condemned as a spineless wimp for not standing up to his father.