Through the use of “black and deep desires” the writer suggests that ambition is a dark and evil force as the dark colours imply to something sinister. This suggests that Macbeth’s ambition and character is corrupt, which is furthered when Macbeth asks for the stars to hide their fires....
By the end of the first act, Macbeth’s moral fabric is overridden by the lust for power even though he starts to doubt his plan to murder Duncan. He uses a metaphor about a horse rider unable to use his spurs to make his horse go faster, but who uses ambition to leap an obstacle...