Macbeth decides to kill Duncan. He sends a letter to Lady Macbeth telling her his plan. She wants him to go through with it. Macbeth is also power hungry and makes his decisions quickly. "Come, you spirts, that tend on mortal thoughts, unsex me here, And fill me, from the crown to the toe, top-full Of direst cruelty! Make thick my blood, Stop up th' access and passage to remorse... Lady Macbeth wants the spirits to change her to a man so she can help go through with the murder.