How Is Macbeth Destroyed by Evil?

In William Shakespeare's Macbeth, there are three key factors that contribute to Macbeth's downfall. These factors are the prediction foretold by the 3 witches to Macbeth, Lady Macbeth's strong influence over her husband and, most important of all, Macbeth's ambition and hunger for power which all lead him down to despair and ultimately death. These three factors have one root - evil.
At the very beginning of the play, Macbeth is portrayed as a brave and honest soldier to the audience, and his character is seen as one of goodness and righteousness. They see him as a courageous, loyal and chivalrous subject of the king.
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