"Thou wouldst be great, art not without ambition, but without the illness should attend it".
Act 2 Scene 1
"Is this the dagger which I see before me the handle toward my hand?"
Act 5 Scene 5
"Life's but a walking shadow, a poor player that struts and frets his hour upon the stage"
In Act 1 Scene 5 of Macbeth, this scene really exposes the ambition of macbeth and lady macbeth. Lady macbeth understands her husbands ambition, but believes he is too soft and nice to take the throne for himself as fast as possible. And the fastest way is to kill the King. Lady Macbeth believes in herself, to influence Macbeth in the way she wants him to go. Macbeth doesnt neccessarily want the same as Lady macbeth, but she will strive to get what she wants.
In this Scene, Macbeth was on his way to kill King Duncan, he got a vision of a dagger in his hand and the blade towards Duncan. This vision made his ambition to Kill King Duncan harder to resist. He was then frightened by the apparition of a "dagger of the mind," Macbeth then prays that the earth will "hear not his steps" as he goes to kill the King.
In Act 5 Scene 5, we are shown that ambition leads to no good both for the ambitious, and the people in the situation. Lady Macbeth was the first to die, she rather commit suicide, than live and suffer eternal damnation for her evil ways she lived by. Macbeth was callous to the whole situation. He seemed as he did not care about his wifes death, he knew it was coming. Shakespeare shown throughtout this play and really finalized in Act 5 Scene 5 that uncontrolled ambition leads to defeat and even death.