The Wierd Sisters in Macbeth The battle between good and evil has been waged for thousands of years. Evil has always tried to find some way to corrupt the good. In the play Macbeth, that is exactly what happens. In this battle for Macbeth's soul, the witches had to first gain his trust. The predictions were the tools for doing so. The apparitions were cleverly shrouded in deceit. The apparitions brought about Macbeth's downfall. Evil has always longed to destroy a good soul and make it one more loss for Nazareth. But before it can do that, the good have to believe in evil. This is why the witches gave Macbeth their predictions. In normal circums