Duality of Humanity in Macbeth

After the murder Banquo's ghost appears to Macbeth during the banquet, terrorizing him. Lady Macbeth tell their guests to leave due to Macbeth's supposed fits. Macbeth then decides to visit the witches and demand more prophecies. While this is going on, Macduff flees to England to get Malcolm and bring him back to claim the throne.
             Macbeth acquires somewhat comforting news from the witches. He is told that he should fear Macduff, however, no one of woman born can hurt him. He is also told that he will not be beaten until Birnam woods moves to Dunsinane. Macbeth gets the impression that he is indestructible, even though he has based all the prophecies on face value. He orders the murder of Macduff's family and servants as pay back to Macduff for openly disapproving him being king. In England, Macduff's loyalty is tested by Malcolm and after seeing that he is indeed loyal to his country, even to the extent of sacrificing his family, he agrees to provide an army and accompany him to Scotland to take down Macbeth. Upon hearing that an English army is heading their way for battle, Macbeth prepares for battle with what little remains of his army. Lady Macbeth has broken down under the strain of guilt from their recent events and commits suicide. However this is the very least of Macbeth's worries as his life appears to lack meaning. Macbeth was in disbelief when he was told that Birnam woods were in fact moving to Dunsinane. The English army had camouflaged themselves with branches. Macduff goes to fight Macbeth and Macbeth learns that Macduff was born by Caesarian. So, like the rest of the witches' prophesies, the last foretelling has come true. Macbeth is killed and Macduff hails Malcolm as king of Scotland. Macbeth is a play of contradiction, throughout it, macbeth changes from one characteristic to another. The theme reveals an individual that possesses two different personalities that fight among themselves.