ACT 1

Banquo fears, for example, that the witches' words will "enkindle [Macbeth] unto the crown"—in other words, that they will awaken in Macbeth an ambition that is already latent in him (I iii 119). His fears seem well-founded: as soon as the witches mention the crown, Macbeth's thoughts turn to murder. The witches’ power is thus one of prophecy, but prophecy through suggestion. For Macbeth, the witches can be understood as representing the final impetus that drive him to his pre-determined end. The prophecy is in this sense self-fulfilling.