Macbeth wrote a letter for lady Macbeth to read.As she reed the letter she was mad at her husband because he wanted to become the king and lady Macbeth wanted to become queen,but the only way for them to become king and queen is by killing the king.Here is a quotation from the book “yet I do fear thy nature,it is too full o’th’ milk of human kindness’,the only problem is that Macbeth isn’t brave and too kind to kill the king.Lady macbeth thinks macbeth’s a wimp and has to do it herself.