I need a quote showing how Macbeth (in Shakespeare's Macbeth) shows a lack of guilt.My thoughts are that after killing Duncun, Macbeth no longer...

I believe that Act III, Scene 1, in Shakespeare's
Macbeth is probably the best scene to gather evidence for the
change in Macbeth's character. Be careful how you express where the change in his
character is evident. He is full of guilt after he kills Duncan; however, Macbeth
becomes ruthless in the events leading to Banquo's murder. I would advise you to first
gather quotations after Duncan's murder to indicate how guilty Macbeth feels at this
point. For instance, you could indicate Macbeth's guilt by quoting his dialogue in Act
II, Scene 2, when he tells Lady Macbeth that he will not go back to place the daggers
near the grooms and smear them with blood after he murders
Duncan.

I'll
go no more:

I am afraid to think what I have
done;

Look on't again I dare
not

As well, at the end of
Act 2, Scene 2, Macbeth hears knocking. His guilt and regret is reflected in his desire
to wake Duncan with the knocking if he could.

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To know my deed, 'twere best not know
myself.

Wake Duncan with thy knocking! I would
thou

couldst!

In
his soliloquy in Act 3, Scene 1, Macbeth is consumed with the witches' prophecy to
Banquo. He also believes that his murder of Duncan will give Banquo's heirs the crown.
He calls on fate to enter into a tournament with him and face him in mortal
combat.

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Rather than so, come, fate, into the
list,

And champion me to the utterance! Who's
there?

Soon after his
soliloquy, Macbeth speaks to two murderers with the same rhetoric Lady Macbeth uses to
convince Macbeth to murder Duncan. Macbeth questions the murderers' manhood. During the
banquet scene, Act 3, Scene 4, one of the murderers appears to tell Macbeth what has
occurred. The murderer tells Macbeth that Banquo's throat was cut. He later tells
Macbeth that Banquo received twenty stabs to his head. Macbeth, who was a "friend" to
Banquo, simply thanks the murderer for his work! He is upset about the fact that
Fleance, Banquo's son, was able to escape. Macbeth is both calculating and ruthless in
the plotting of Banquo's murder. In addition, Macbeth does not plan Banquo's murder with
Lady Macbeth, which also indicates a transformation in his
character.