Textual Analysis on lines 35-70 in Scene V, Act I of Macbeth.

Lady Macbeth has read her husband's letter concerning his meeting with the three weird sisters and their predictions. One of the witches had prophesized that Macbeth would become the king. Lady Macbeth is pleased but she knows that Macbeth may be ambitious but he couldn't possibly carry out the murder of King Duncan which would probably be necessary to give him the crown. She knows that without her intervention Macbeth will never be a king. …

…hears of the prophecies and commits to murdering Duncan so that she can become the queen. But she has to have Macbeth team up with her so she tries and persuades him. It is Lady Macbeth's influence which leads Macbeth to assassinate Duncan eventually. Without Lady Macbeth's intervention, Macbeth would probably have never killed Duncan. So this is an important stage in the plot. [The analysis is too short and not elaborate enough I guess]