Macbeth’s weakness of mind and character allowed the witches to manipulate him psychologically, rather than acting as a supernatural force. The Weird Sisters were pivotal in Macbeth’s eventual breakdown. They choose their target very wisely, and since Macbeth is, to them, merely a worthless pawn, the loss of his sanity was not even considered a small price to pay, but a pleasurable consequence. Until Macbeth’s encounter with the witches, he was a noble character, but they planted evil seeds into his mind. They found a deficiency in Macbeth’s character- greed, and explored that flaw so dexterously and thoroughly that it led to tragedy. This tragic flaw is the catalyst of the whole story, since the play is entirely based on the repercussions of Macbeth’s madness and greed.
Macbeth’s fraility and impending corruption make him an easy target for the Weird Sisters. They see his potential to become someone ruled by greed and malevolence, and know exactly how to trigger the evil inside Macbeth. They see his mind as a blank slate- although they cannot write on it, they can whisper to him their ideas and hand him a pen. Macbeth is their best bet- other royals, such as Macduff and Banquo, were not so easily corruptible.
This is evident during Macbeth’s first encounter with the witches. He is accompanied by Banquo, who was then his best friend. Upon their predictions of Macbeth and Banquo’s “destiny”, Banquo is quick to dismiss any influence they might be trying to exert on him. Macbeth, on the other hand, is dazzled by the idea of becoming king. After receiving the title of Thane of Cawdor, he says, “Glamis, and thane of Cawdor! The greatest is behind.” (I.iii.116-117), referring to becoming King of Scotland. With this correct information, which Macbeth perceives as a prediction, the Weird Sisters have won Macbeth’s trust, but more importantly, have opened the gates of evil thoughts in his mind.
Despite having a part of him that still suspects of them, he is very trustful. “This supernatural soliciting/ Cannot be ill, cannot be good. If ill,/ Why hath it given me earnest of success, / Commencing in a truth? I am thane of Cawdor. / If good, why do I yield to that suggestion / Whose horrid image doth unfix my hair / And make my seated heart knock at my ribs, / Against the use of nature? Present fears / Are less than horrible imaginings.”(I.iii.131-139) He...