“It is too full o’th’milk of human kindness”.
She obviously is like Macbeth in the sense that he is kind to kill Duncan and is going to need a lot of persuading and corrupting , it is clear that she is an evil woman. In her first speech she also talks about turning him evil, she describes this deed in such a way it portrays her as some kind of witch or insane person,
“That I may pour my spirits in thine ear
And chastise with the valour of my tongue.”
Lady Macbeth shows true determination to have this deed done; she talks about becoming a man to do the job, probably meaning a woman would not do this job,
“Unsex me here…Come to my woman’s breasts and take my milk for gall.”
The one thing that Lady Macbeth says that shows real sick determination is the fact that she says she would kill her own child just to have Duncan dead and her and Macbeth on the throne,
“Have pluck’d my nipple from his boneless gums
And dash’d the brains out…”
Although she talks about her child it has been disputed if they actually have a child or not as it is not mentioned in the play. Lady Macbeth is ruthless as shown in that last comment and that is what probably convinces Macbeth that she is determined (if a little twisted).
The Second Force that turns Macbeth is the 3 Witches. They are the first characters we meet in the play and start it off on a dark note. When they first meet him he is with Banquo, who suspects something from the start. They fill his head with ideas about king etc. The witches are the characters responsible for giving him to get the title of Thane of Cawdor. When he becomes Thane of Cawdor he begins to trust them and says himself,
“What can the devil speak true?”
When we first see them they speak of all evil things that they have done and all the evil in the cauldron. They want Macbeth’s soul for hell. They want Duncan’s but cannot get it because he is pure and good. Many people argue that the witches are not an important force because it is not them who are actually doing the deed; evil spirits who by they do all the wishes of the devil controls them. This leads people to suggest that they are powerless without them. Macbeth does have some uncertainty about the witches; this is when he questions them over the Thane of Cawdor. He questions them and they disappear, this shows that although he is powerful he doesn’t have a lot of power of them. In Act 1, Scene 4, Macbeth’s speech is seemed to be “infected” by that of the witches, he begins to talk in rhyme a form uncommon in Shakespeare’s plays and only used by truly evil characters such as the witches, whereas he is seen to rhyme for eight lines in a row.
The final force to turn Macbeth was himself. He lacked in character for a lot of the play, especially at the beginning when the witches tempted him with the stories of him becoming the Thane of Cawdor. Greed was another factor of Macbeth’s leading to the killing of Duncan, It is said in the book that Macbeth has a very bad evil seed planted in him.
Macbeth has a constant battle in his head at the beginning of the play about whether to kill Duncan, although he has discussed it before he still finds it hard to accept the fact that he has to kill Duncan. Macbeth is a good person because he struggles to find reason to kill Duncan because he is a good friend with him and he is good. It has been said to compare the temptation of Macbeth with the temptation of Jesus in the desert (tempted by the devil).
All of these factors helped Macbeth go that step further to become evil, murder Duncan, and bring out all his evil qualities that had not been seen before.