Why was the prophecy of royal kingship beyond belief for Macbeth?

Answer 1

In Act 1 Scene 3 of the Shakespearean play, friends and fellow Generals Macbeth [c. 1014-August 15, 1057] and Banquo met the three witches. The witches astounded Macbeth with their predictions of job advancement. Macbeth was hardworking, and appreciated recognition and reward for good work. He also was ambitious, but practical. He considered the Thane of Cawdor and King of Scotland as positions outside of what he reasonably could expect. He commented to the witches that Cawdor was still alive, and had a lot of money and power [Lines 72-73]. He characterized both titles as 'not within the prospect of belief' [Line 74]. The particular incredibility of gaining the kingship may have been based on the character of King Duncan I [d. August 14, 1040] and the nature of royal succession. The King may not have been generous in recognition or reward. For example, he gave Macbeth Cawdor's title and possessions. But he gave nothing to Banquo, who also had acquitted himself well in the recent battles against invading Norwegians and rebellious Scotsmen. In the way of another example, the King decided that he'd spend the night at the Macbeth's home at Inverness Castle. That gave Lady Macbeth very little time to prepare the household. Additionally, the King had two sons: Malcolm, who became the subsequent King Malcolm III [d. November 13, 1093]; and Donalbain, who became the subsequent King Donald III [d. 1099]. The King bestowed the title of Prince of Cumberland upon Malcolm, his elder son and heir apparent. So it may have looked to Macbeth that his succession to the throne of Scotland had too many obstacles. The reigning King had children who could, and wanted to, succeed him. The reigning King may not have had a reputation for sharing. So why would he buck tradition and let anyone other than his children succeed him?

Answer 2

He's thinking that this supernatural soliciting cannot be good and cannot be ill. He's not sure what to make of it.