In Act II, Macbeth gives his famous dagger soliloquy that begins,
"Is this a dagger which I see before me,
The handle toward my hand? Come, let me clutch thee.
I have thee not, and yet I see thee still.
Art thou not, fatal vision, sensible
To feeling as to sight? or art thou but
A dagger of the mind, a false creation,
Proceeding from the heat-oppressed brain?"
In what ways has the use of the dagger brought a "fatal vision" and an "heat-oppressed brain" to Macbeth and Lady Macbeth? What has happened to both of them because they killed? What is Shakespeare saying through these changes? (The deadline to post a response to this question is midnight, Saturday, October 15, 2011.)