Macbeth is originally a hero to Scotland, and a strong character. He is a Lord under the rule of King Duncan, and has no reason to feel unhappy with his position. It is only after the prophecies of the Weird Sisters, that he begins to long for the throne of Scotland, and even then needs Lady Macbeth to convince him to commit the murder.
Lady Macbeth, on the other hand, begins as pure evil, and remains that way. She has previously been married, and is therefore presumed older and trickier than Macbeth. She appears to always be using him for her own gain, by using her femininity to seduce him into doing the wrong thing, and in this way she persuades him to kill the king.
When Macbeth hears the prophesies of his future, he appears to disregard them, but when he is made Thane of Cawdor (as foretold), he already is considering murdering the king: "My thought, whose murder yet is but fantastical, shakes so my single state of man that function is smothered in surmise and nothing is but what is not.". It is perhaps for this reason that he writes to Lady Macbeth, as though prompting her for some persuasion for him to kill Duncan, and she later refers to this as his agreement on the murder:"Nor time nor place did then adhere, and yet... [continues]
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