Shakespeare used illiteration to highlight the bad influence. If not accepted at face value, it makes the audience question what the play is about and if there is anything deeper at work. So, in his first sentence, Macbeth says, 'So nasty and fair a day I have not seen.' The witches' words were employed by Macbeth. He asked them if he would be king after all, and they said he would. This means that Macbeth is responsible for his own actions and should do as he sees fit. Now, let's look at some more examples from Macbeth. At the end of Act 1 Scene 5, before we hear what has happened in Act 2, we are told that 'Macbeth does murder sleep'. This means that whatever evil deeds Macbeth does, it will only happen during his dreams. This shows that Macbeth is completely responsible for his actions even when he sleeps. Also, in Act 3 Scene 4, after King Duncan has been killed, Lady Macbeth says: 'The Thane of Glamis -/ As wicked as syphilis -/ Is ripe for death'. Again, this shows that even though she lives in Scotland, she has access to information about Macbeth that we don't know. This implies that she must be guilty too so she can tell such horrible things about her husband.