*To Banquo "Thou shalt get kings, though thou be none"(1.3. 67)
"All hail, Macbeth, that shall be king hereafter!" (1.3. 50)
“Mynoble partner you greet with present grace, that he seems rapt withal” (1.3. 67)
"Your children shall be kings" (1.3. 86)
"You shall be king" (1.3. 87)
"Our eldest, Malcolm, whom we name hereafter The Prince of Cumberland"(1.4.38-39)
“Thatis a step on which I must fall down or else o’erleap” (1.4. 48-49)
The theme surfaces the moment the three witches appear before Macbeth and Banquo and tells them about their prophecy. Macbeth is left in a trance, almost as if already envisioning himself in power. Banquo notices this.
“Stars, hide your fires; let not light see my black and deep desires” (1.4. 50-51)
“When you durst do it, then you were a man" 1.7. 49-50)
After the witches vanish, the first thing that Macbeth does is reference to what was told to Banquo about his prophecy. This goes to show that Macbeth was possibly already thinking of ways his prophecy to be king could be endangered.
“Falseface must hide what the false heart doth know” (1.7. 82)
Later on in the kings palace, it is announced that Malcolm will be the new king of Cumberland. In this moment, Macbeth realizes a problem between Malcolm and the prophecy. He ends up having a dark thought in which he contemplates murder. This goes to show how corrupted he was becoming due to power.
“From this moment the firstlings of my heart shall be the firstlings of my hand”(4.1. 146-148)
“The castle of Macduff I will surprise,… Seize upon Fife, give to th’ edge o’ th’ sword” (4. 1. 150-151)
After leaving the kings palace, Macbeth sends a letter to his wife in which he tells her all about the prophecy and the kings plans to come to their home for a celebration. He tells her of his evil plans and asks her to prepare. This scene shows him contemplating murder therefore showing how far he was willing to go just for the thirst of power.
At the very end of act 1, Macbeth is filled with regret and almost chooses not to kill Malcolm but in the end is convinced by his wife after she threatens his manliness. This scene shows how easily he could be convinced to do an evil act and how corrupted he was becoming.
As Macbeth continues to gain more power, he becomes more unstable as well. In a fit of rage, Macbeth promises to act only on impulse. He then carries out a murder plan on Macduff. This shows how corrupted Macbeth came to be due to power.