The Witches: Setting the Tone
The play opens with "Thunder and Lightning. Enter three witches" – a perfect example of pathetic fallacy that immediately establishes an ominous mood. This dramatic entrance would have terrified Jacobean audiences, who genuinely feared witchcraft as a punishable crime linked to the devil.
Their famous paradox "Fair is foul, and foul is fair" introduces one of Macbeth's central themes: appearances are deceptive. Shakespeare warns us not to trust surface impressions, foreshadowing how characters (especially Macbeth) will hide their true intentions behind masks of loyalty.
The witches speak in trochaic tetrameter instead of the iambic pentameter used by human characters, making them sound distinctly otherworldly. Their language frequently employs the power of three ("I'll do, I'll do and I'll do"), mockingly echoing the Holy Trinity and reinforcing their connection to evil forces.
Quick Insight: When Macbeth later says "So fair and foul a day I have not seen," he unknowingly echoes the witches' words, suggesting he's already under their influence before even meeting them!
The witches' prophecy that "Macbeth, that shalt be king hereafter" plants the seed of ambition that drives the entire plot. Their ability to foreshadow future events not only demonstrates their supernatural power but establishes their credibility when these predictions eventually come true.