How does Lady Macbeth's penultimate (second last) speech in the scene relate to earlier thoughts in the play?This is act 1 scene 5....

Since this scene is our first meeting of Lady Macbeth, I'm
going to assume that you are seeking out the speech that begins:  "The raven himself is
hoarse," and that the "earlier thoughts" have to do with other characters earlier in the
play.

Well, in this speech, Lady Macbeth is calling on the
forces of darkness to make her strong and resolute, like a man, not a soft and motherly
woman, so that whatever needs to take place (murder), so that Macbeth can become King,
will.  She concludes:

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...Great Glamis!  Worthy
Cawdor!

Greater than both, by the all-hail
hereafter!

These words and
the incantation that calls upon unseen forces of darkness relate back to the witches in
Act I, scene iii.  They greet Macbeth with "All hail, thane of Glamis" and "All hail,
thane of Cawdor" and finally "All hail, Macbeth, that shalt be king
hereafter."

So, the forces of evil or darkness are
suggested to be at work in Macbeth's rise to power.  First in the witches' prophesies
and then echoed by Lady Macbeth.