It's unlikely that Macbeth would have committed the crimes without the influence of the Witches
The Witches are associated with the imposition of an unnatural order
The Witches try to undermine what's good and natural
Macbeth says the Witches 'untie the winds'
The Witches are cruel,evil and celebrate malevolence
Macbeth sees a dagger which he describes as 'bloody business'
Macbeth sees Banquo's ghost which gives him a strange 'infirmity' that nobody else can see
The visions are a visual representation of Macbeth's guilty conscience
In Act 5, Sc 1, Lady Macbeth says her hands will 'ne'er be clean' of Duncan's blood, suggesting her great guilt
Lady Macbeth's language and actions when sleepwalking suggest she is disturbed
Macbeth is 'blanced with Fear'
Lady Macbeth commits suicide
"None of woman born shall harm Macbeth" Witches act as catalyst to Macbeth's delusion and they cause his Hamartia* by making him confident he will not be killed.
