What substance (mentioned twice) does Lady Macbeth say is the only thing Macbeth needs to feel better?

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ExplanatioWAND WD NAWD MAWD MD AWDn:

the difference between an explicit and implicit meaning is that the explicit meaning of a poem is that the detail is exactly defined. nothing is left to interpretation. an implicit meaning is an implied meaning. kabir's poetry is both explicit and implicit in that it can be interpreted on different levels. the explicit meaning leaves nothing to interpretation while the implicit meaning leaves lots open to interpretation. an example of this is found in the poem "rumi and the spiritual lover". 

in the sonnet 116 written by william shakespeare we can analyze the symbolism and say that he reuses the idea of love like a guiding star for the sailor.

reading through the poem we find out that in the line 7 there is a metaphor for the lover that is heading through the life events by love itself .