[Duncan] O valiant cousin, worthy gentalmen! (Act 1. scene 2. line 26)
[Capitain] The multiplying villanies of nature Do swarm upon him—from the Western Isles Of kerns and gallowglasses is supplied, And fortune, on his damnèd quarrel smiling, Showed like a rebel’s whore. But all’s too weak, For brave Macbeth (well he deserves that name) (Act 1. Scene 2. lines 13-18)
Act 1, sc. 7
If we should fail? (Act1. scene 7. line 58)
Act 2, sc. 1
Macbeth in this scene is shown to be a brave and noble warrior and is greatly respected. He is praised and given prices for his victories and bravery.
Act 2, sc. 2
In this scene Macbeth is conflicted between killing Duncan or not, but then Lady Macbeth manipulates him and encourages him to fulfill his ambition.
Act 3, sc. 1
[Lady Macbeth] We fail? But screw your courage to the sticking-place, And we’ll not fail. When Duncan is asleep— Whereto the rather shall his day’s hard journey Soundly invite him—his two chamberlains Will I with wine and wassail so convince That memory, the warder of the brain, Shall be a fume (Act 1. scene 7. lines 59-66)
And with him— To leave no rubs nor botches in the work— Fleance, his son, that keeps him company, Whose absence is no less material to me Than is his father’s, must embrace the fate Of that dark hour. Resolve yourselves apart. I’ll come to you anon. (Act 3. scene 1. lines 152-158)
In this scene Macbeth is nervous and hallucinating a bloody dagger leading him to Duncan's room. Because of his desire for power Macbeth ends up killing Duncan.
Act 3, sc. 4
Is this a dagger which I see before me, The handle toward my hand? Come, let me clutch thee. I have thee not, and yet I see thee still. Art thou not, fatal vision, sensible To feeling as to sight? Or art thou but A dagger of the mind, a false creation, Proceeding from the heat-oppressèd brain? (Act 2. scene 1. lines 44-51)
Macbeth is completely shocked after killing Duncan that he didn't even left the dagger on the room so Lady Macbeth goes back and leave it there. He can't stop seeing the blood on his hands and does not want go to Duncan's room wanting to completely forget what he had done.
I’ll go no more: I am afraid to think what I have done; Look on ’t again I dare not. (Act 2. scene 2. lines 65-67)
Why did you bring these daggers from the place? They must lie there. Go carry them and smear The sleepy grooms with blood. (Act 2. scene 2. lines 62-64)
Now Macbeth is completely consumed by power, even arranging his friend Banquo's murder, because he is smart and would someday find out what Macbeth had done.
We are resolved, my lord. (Act 2. scene 2. line 159)
Now Macbeth is hallucinating, seeing Banquo's bloody ghost on his banquet table. In this scene he is completely scared and now we cannot see the noble and brave warrior that he once was.
Thou canst not say I did it. Never shake Thy gory locks at me. (Act 3. scene 4. lines 61-62)