Macbeth Ambition

If is Macbeth's ambition that defeated his good nature, and
that pushed him to break all moral boundaries. Before his
encounter with the three witches (Act I, Scene III), Macbeth
was a loyal man. He was loyal to his King, to his wife, and to
his friends. Despite his loyalty, there is evidence in the play
that shows Macbeth thought or dreamt of becoming King before he
met the witches. This evidence is supported by human nature: if
Macbeth had not wanted to become King, the witches' predictions
would not have had an effect on him. The witches were able to
manipulate Macbeth by turning his secret ambition (his want to
become King) into a horrible reality. Macbeth was initially
led to evil by the witches' predictions. Once he heard them
predict that he was to become King, "All hail, Macbeth! that
shalt be king hereafter!" (I.3.52), he did not want to wait any
longer. In Macbeth's letter to his wife, he tells her of the
witches prophecies. Again, if Macbeth had no intention of
acting upon this information.