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please help me~i am desperate!!"Unhappy man! Do you share my madness? Have you drank also of the intoxicating draught? Hear me -- let me reveal my tale, and you will dash the cup from your lips!"from frankenstein
A "cup" is a common metaphor; as in the "cup of knowledge". In this passage; to "dash the cup from your lips" means to stop drinking from the cup. To unlearn what you have learned; or, to stop believing in what you believe.