Supernatural Influence and Unnatural Acts
You'll spot supernatural themes everywhere in Macbeth, and they're crucial for understanding the play's central message. When the doctor says "unnatural deeds do breed unnatural troubles," he's not just talking about Lady Macbeth's sleepwalking - he's highlighting how going against the divine right of kings creates chaos throughout the natural world.
The witches appear completely alien to human society, which would have terrified Shakespeare's audience. Banquo's description of them as beings that "look not like th'inhabitants o'th'earth" emphasises their inhuman nature and reflects the Jacobean fear of witches. Remember, King James I even wrote a book condemning supernatural practices, so these characters would have seemed genuinely threatening.
Notice how Banquo questions the witches whilst Macbeth immediately trusts them. This contrast is vital - Banquo represents caution and loyalty (he was supposedly James I's ancestor), while Macbeth shows dangerous gullibility. The slow, hesitant rhythm in Banquo's speech mirrors his careful, thoughtful approach.
Key Point: The supernatural doesn't just add spookiness - it reveals each character's true nature and moral compass.