Lady Macbeth attempts to force Macbeth to regain his composure by chastising him for his lack of control and urging him to conceal his feelings. This occurs in Act 3, Scene 4 of Shakespeare's "Macbeth" after Macbeth sees the ghost of Banquo during a banquet.
In response to Macbeth's visible distress at seeing Banquo's ghost, Lady Macbeth tries to mitigate the situation by addressing the guests and reprimanding Macbeth:
"O, proper stuff! This is the very painting of your fear.
This is the air-drawn dagger which you said
Led you to Duncan. O, these flaws and starts,
Impostors to true fear, would well become
A woman's story at a winter's fire,
Authorized by her grandam. Shame itself!
Why do you make such faces? When all's done,
You look but on a stool."
In these lines, Lady Macbeth is essentially accusing Macbeth of displaying fear and weakness in front of their guests. She dismisses his emotional reaction as a mere illusion or figment of his imagination. Lady Macbeth is desperately trying to control the situation, maintaining appearances and preventing any suspicion about their involvement in Banquo's murder.