Those witches haunt my nightmares. Do you ever think of what they said, Macbeth?
Phew, he believed me.
What is this? A dagger that spins before me! It's handle points to me and it's blade leads me to where I must go. Though not present in the world it is present in my mind, a trick of my eyes by the murder I am to commit.
Floor, don't track where my footsteps lead. The bell is my cue, I must go now with this real dagger drawn. Duncan, ignore the rings of this bell, for it sends you to heaven or hell.