In Macbeth, what could be the witches' motivation for tricking Macbeth ?

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To understand the witches' motivations, take a look at act III, scene V. In this scene, Hecate and the witches are talking about Macbeth. Based on what Hecate tells the witches, it seems that they trick Macbeth purely because they can. They find it fun to interfere in Macbeth's life and watch the chaos which ensues.

To support this idea, take a look at this quote:

As by the strength of their illusion

Shall draw him on to his confusion.

In other words, Hecate intends to produce a spell which will confuse Macbeth about his future. Moreover, as a result of this spell, Hecate will fool Macbeth into thinking that he is untouchable, that he is above the forces of fate and death.

What we see, then, is that witches enjoy using their magical powers to create mischief. They enjoy influencing the life of Macbeth purely because they can. For them, it is almost like a form of entertainment.

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The witches, who are also called "the three sisters," an allusion to the mythological goddesses who controlled the fate of humans, delight in manipulating mortals.

This manipulation of the lives of mortals enhances their sense of power as well as providing them enjoyment. In Act I, Scene 3, for instance, the three witches boast to one another of their accomplishments, their evil and disrupting acts. For instance, because a sailor's wife would not share her chestnuts with the first witch, the evil spirit decides to whip up a terrible storm for the husband who is at sea":

But in a sieve I'll thither sail,
And, like a rat without a tail,
I'll do, I'll do, and I'll do. (3.1.7-10)

Certainly, these evil sisters are an intrinsic part of Shakespeare's play, fueling the character faults of Macbeth and motivating his ambitious actions; for instance, when they call him the Thane of Cawdor and Macbeth is later awarded this title by King Duncan, Macbeth then believes that the witches know the future.  This credulity allows the witches much pleasure as they can exercise their many dark machinations.

In addition to their important contributions to the plot of Macbeth, the witches reinforce the cultural beliefs of the Elizabethans who felt that the supernatural played an intrinsic part in their lives. 

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