Read the following excerpt. Excerpt from Macbeth
LADY MACBETH: "Who was it that thus cried? Why, worthy thane,
You do unbend your noble strength, to think
So brainsickly of things. Go get some water,
And wash this filthy witness from your hand.
Why did you bring these daggers from the place?
They must lie there: go carry them; and smear
The sleepy grooms with blood."
Evaluate and explain the effect the tone of these words as they are used in Macbeth.