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Cordelia turns the Doctor’s literal statement into a metaphor in Act 4, Scene 4 when she says
that the sleep necessary to cure Lear would be a kind of death.
that she will water the herbs necessary to cure her father with her tears.
that the herbs required to give Lear repose will govern his rage like the king he could have been.
that her tears will be the foster-nurse who administers medicine to her father.
that the herbs will close their eyes before Lear so as not to witness the distress of the man they are curing.