hen he went back to see the witches he gained some more knowledge, "Macbeth! Macbeth! Macbeth! beware Macduff; Beware the thane of Fife." [Act IV, S I, L 77], well now that Macbeth has heard this, he believes that he must kill Macduff, however he learns that Macduff has fled to England, so Macbeth desides to kill his family. Next in the cave Macbeth is told he can't be killed by any man born of woman, well this gives him confidence that no matter what the English will not defeat him. And he is also told that he will not be defeated until the trees of Birnam Wood move towards his castle. He has put all his faith in these prophecies, what the witches say must be true because of the first prediction.In conclusion you can see what fear can do to a person, it made Macbeth mad for power which he ended up getting. But after the first of his crimes the rest became easier for him, pretty soon he'd just order it and not think twice. That was not the case when he first murdered Duncan. All though the play his fear of being caught, and the witches prophecies coming true make him do all these evil deeds. Fear had become the main movating factor in the play. Hopefully you have a better understanding of the play from all this....
