One could argue that this statement is accurate and valid.
Before Macbeth is given favorable prophecies by the three witches, he is depicted as a heroic, loyal follower of King Duncan, who valiantly serves his king on the battlefield by defeating Macdonwald, the Norwegian king and the former Thane of Cawdor. Once Macbeth meets the witches on the heath and listens to their favorable prophecies, he becomes thoroughly convinced of their validity following Ross's declaration that Macbeth has been named Thane of Cawdor. Ross's message regarding Macbeth's new title corresponds to one of the witches' prophecies, and Macbeth's ambitious nature immediately begins to motivate him to attain the Scottish throne (an outcome that was also foretold by the witches).
Thus, after one prophecy is fulfilled, Macbeth begins to contemplate assassinating King Duncan. Although Macbeth's ambition motivates him to become king, he is nevertheless reluctant to murder Duncan. Macbeth's conscience prevents him from taking...
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