 Studying Macbeth, let's look at quotes showing Macbeth's paranoia once he becomes king. In Act 3 Scene 1, we can see that he still sees Banquo as a threat, and that the Sazura after be safely thus shows that he wants to ensure that Banquo is no longer a threat by having him killed. He uses words royalty and reigns, which belong to the semantic field of monarchs, in other words his remembering how the witches said that Banquo's kids will be kings. His repetition of the word fear shows his paranoia at Banquo. The alliteration here shows that Macbeth is quite jealous of Banquo's wisdom. The nouns mock Anthony and Caesar are referenced to Julius Caesar. Macbeth sees himself as Caesar, however, mock Anthony is a person that did take over after Caesar was killed. Therefore, he sees Banquo as a mock Anthony. Macbeth's jealousy that Banquo's kids will be king is shown in this metaphor of fruitless crown. In other words, he's going to be king, but his kids won't be kings. He also contemplates to make them kings the seeds of Banquo's kings, and the repetition of the words kings show he's violently against Banquo's kids taking over. Therefore, he has to kill Banquo.