Macbeth has "black and deep desires" regarding dutchman's son and heir, malcolm.
Macbeth reacts to Duncan declaring his son Malcolm heir to the Scottish throne with shock and anger. Tanistry in Scotland leads to Duncan's decision, and that made Macbeth desire revenge and to take the throne that he felt he deserved by killing him.
"The Prince of Cumberland! That is a step on which I must fall down or else o'erleap." The idea was that the Prince of Cumberland was the heir apparent, like the Prince of Wales in England.
What he says is:
The Prince of Cumberland! that is a step
On which I must fall down, or else o'erleap,
For in my way it lies.
and that expresses pretty exactly what he is thinking. He is not going to become king as the witches promised if Malcolm is the heir to the throne. Of course, in doing this he is twisting what the witches said. They promised that he would be "king hereafter", which means sometime in the future, not necessarily immediately after Duncan. Of course Macbeth had visualized the prophecy coming true by Duncan making Macbeth his heir (which he would have done if he had made his choice based on ability rather than nepotism), and when that scenario does not materialize, Macbeth cannot imagine any other way that he can become king save by murder and usurpation. In this way perhaps a character fault that leads Macbeth to his doom is his limited imagination.
"The Prince of Cumberland! That is a step on which I must fall down, or else o'erleap, for in my way it lies." The optimistic part of Macbeth which would let fortune crown him suffers a severe blow, and the part that thinks he will never be king unless he takes drastic action gets a boost.
Macbeth secretly reveals that Duncan's plans are in the way of his own desires.
jealous,and wants to hide his murderous thoughts
Macbeth is shocked and enraged when Duncan gives the throne to his own son, Malcolm. Macbeth then kills Duncan in his sleep so that he can take the throne.
He's sad, and a little surprised, and possibly a bit angry.
Donalbain and Malcolm were the sons of King Duncan I [d. August 14, 1040]. Malcolm must have been the elder son. The indication of his being the older of the two brothers was his receipt of the title of Prince of Cumberland, as heir apparent to his father. Malcolm indeed ascended to the throne before his brother, under the name of King Malcolm III [d. November 13, 1093]. His brother succeeded him as King Donald III [d. 1099]
Macduff believes that Macbeth killed King Duncan and thus doesn't believe Macbeth should be king. This is evident in the fact that while Macbeth goes to Scone, Macduff finds Malcolm and convinces him to reclaim the throne.
I believe Macbeth feels threatened of Banquo. During act 4, Banquo is astonished of how the prophecy's about Macbeth have come true, and wonders if what the 3 ugly sisters (3 witches) predicted for him, will also come true - that his sons will become king. Macbeth is threatended by, this is because he wants to be king for a long as possible and then wants the position as king to pass down through generation in his family. Therefore because of this, Banquo and his son fleance is in his way/ path of what he wants and so he decides to plan h is murder.
This is a somewhat disputed issue. According to the traditional Scottish method of selecting successors to a king, called tanistry, the new king was elected from the late king's close relatives. We see a reflection of this practise in this conversation in Act 2 Scene 4: "Then 'tis most like the sovereignty will fall on Macbeth" "He is already named, and gone to Scone to be invested." In such a system, Macbeth would have had a reasonable expectation of being king, because he was Duncan's first cousin, very closely related. Indeed he seems to be somewhat surprised when Duncan names Malcolm Prince of Cumberland (thus nominating him as the tanist or successor). Some historians think that tanistry had already been overtaken by primogeniture in Scotland by the time of Macbeth. If that is the case, then there would have been no surprise to Malcolm being named as Prince of Cumberland. It would explain why Macbeth says to the witches "to be king stands not in the prospect of belief." if he was only third in line to the throne, after Malcolm and Donalbain. It might be surmised that the only reason Macbeth even considers the idea of kingship is because the witches tell him it will happen. It also might be thought that at first Macbeth believes the king will announce that his sons aren't ready, and that Macbeth should take the throne instead. But under the system of primogeniture he would have no right to do so, and under the system of tanistry the heir is elected, not chosen by the king, so Duncan would have no power to do so under this system either. It has been noted that the play seems to celebrate a triumph of English customs over Scottish ones--Malcolm, backed by English troops, abolishes the Scottish title "Thane" and replaces it with the English one "Earl". It might be seen also that Malcolm represents the English system of primogeniture whereby the son of the last king, no matter how unworthy (and nobody can dispute that Malcolm is useless as a warrior) automatically becomes king, whereas Macbeth represents that indigenous Scottish system, based in part on merit, which primogeniture replaced.
stop being so indecisive and take immediate action.
Malcolm being named Prince of Cumberland makes him the heir apparent to the Scottish throne, putting him in a strong position to challenge Macbeth for the crown. It also highlights the legitimate claim Malcolm has to the throne, further emphasizing Macbeth's position as a usurper.
I suppose you are asking about Malcolm being made Prince of Cumberland. The idea was that he was being marked out as the heir apparent--sort of like making someone Prince of Wales.
The suggestion is that the title was like the Prince of Wales: it was the title of the heir apparent.
In Act 1, Scene 4 of "Macbeth," Banquo is honored by being named a nobleman and receiving the title of the Thane of Lochaber. Malcolm, the Prince of Cumberland, is also honored by being declared heir to the Scottish throne by King Duncan.
Malcolm was a suspect in the murder of King Duncan because he fled Scotland immediately after his father's death, which made him look guilty of being involved in the assassination plot. Macbeth, the true culprit, used Malcolm's hasty departure to cast suspicion on him and secure his path to the throne.
Donalbain and Malcolm were the sons of King Duncan I [d. August 14, 1040]. Malcolm must have been the elder son. The indication of his being the older of the two brothers was his receipt of the title of Prince of Cumberland, as heir apparent to his father. Malcolm indeed ascended to the throne before his brother, under the name of King Malcolm III [d. November 13, 1093]. His brother succeeded him as King Donald III [d. 1099]
After the successful battle at the beginning of Act I, Duncan rewards Macbeth for being a war hero by giving him the title Thane of Cawdor. In the same scene (Act I Scene 4) he rewards Malcolm for no particular reason with the title Prince of Cumberland, and then says, "From hence to Inverness, and bind us further to you." Inverness is the city where Macbeth lives, and Duncan is in effect saying, "Hey guys, the party's at the Macbeths'!" This is significant because it will put him in range of Lady Macbeth, who will be the death of him.
because she wanted to have sex with him instead
Macduff believes that Macbeth killed King Duncan and thus doesn't believe Macbeth should be king. This is evident in the fact that while Macbeth goes to Scone, Macduff finds Malcolm and convinces him to reclaim the throne.
I believe Macbeth feels threatened of Banquo. During act 4, Banquo is astonished of how the prophecy's about Macbeth have come true, and wonders if what the 3 ugly sisters (3 witches) predicted for him, will also come true - that his sons will become king. Macbeth is threatended by, this is because he wants to be king for a long as possible and then wants the position as king to pass down through generation in his family. Therefore because of this, Banquo and his son fleance is in his way/ path of what he wants and so he decides to plan h is murder.
This is a somewhat disputed issue. According to the traditional Scottish method of selecting successors to a king, called tanistry, the new king was elected from the late king's close relatives. We see a reflection of this practise in this conversation in Act 2 Scene 4: "Then 'tis most like the sovereignty will fall on Macbeth" "He is already named, and gone to Scone to be invested." In such a system, Macbeth would have had a reasonable expectation of being king, because he was Duncan's first cousin, very closely related. Indeed he seems to be somewhat surprised when Duncan names Malcolm Prince of Cumberland (thus nominating him as the tanist or successor). Some historians think that tanistry had already been overtaken by primogeniture in Scotland by the time of Macbeth. If that is the case, then there would have been no surprise to Malcolm being named as Prince of Cumberland. It would explain why Macbeth says to the witches "to be king stands not in the prospect of belief." if he was only third in line to the throne, after Malcolm and Donalbain. It might be surmised that the only reason Macbeth even considers the idea of kingship is because the witches tell him it will happen. It also might be thought that at first Macbeth believes the king will announce that his sons aren't ready, and that Macbeth should take the throne instead. But under the system of primogeniture he would have no right to do so, and under the system of tanistry the heir is elected, not chosen by the king, so Duncan would have no power to do so under this system either. It has been noted that the play seems to celebrate a triumph of English customs over Scottish ones--Malcolm, backed by English troops, abolishes the Scottish title "Thane" and replaces it with the English one "Earl". It might be seen also that Malcolm represents the English system of primogeniture whereby the son of the last king, no matter how unworthy (and nobody can dispute that Malcolm is useless as a warrior) automatically becomes king, whereas Macbeth represents that indigenous Scottish system, based in part on merit, which primogeniture replaced.
stop being so indecisive and take immediate action.