Avaunt! and quit my sight! let the earth hide thee!
Thy bones are marrowless, thy blood is cold;
Thou hast no speculation in those eyes
Which thou dost glare with!
– William Shakespeare
Macbeth, Act 3, Scene 4. When Banquo’s ghost re-appears at the feast at Macbeth’s home, a paranoid Macbeth orders him to go away. He is trying to reassure himself that Banquo cannot be alive. Macbeth’s feeling of guilt at ordering his friend’s murder is so overwhelming that he cannot distinguish between reality and imagination, which has conjured up the ghost. A tormented Macbeth is losing his grip on sanity.