"I will not be afraid of death and bane Till Birnam Forest come to Dunsinane" (V, 4, 59-60). Macbeth shows no fear because he feels powerful and thinks he's unstoppable. This is not true and leads him to his death. He fights thinking no one can kill him until Macduff gives him a vital wound.
Macbeth had a power which lead to his death. He thought he could control everyone by killing them. The power that Macbeth thought and felt he had, he abused it. This power turned around, only to spoil anything he could have had. .
Lady Macbeth had a power in which she controlled Macbeth. She felt that Macbeth had no manly side to him. Lady Macbeth was the one with the plans and who made it all happen. Without her Macbeth would be nothing and probably wouldn't have fallen through with the murder.
Lady Macbeth wanted nothing more but the crown. In fact, she wanted it more than her husband, but if she couldn't have it Lady Macbeth would be just as happy with her husband having it. Since Lady Macbeth felt she had more manliness than Macbeth, to be a man herself would be a dream come true. "Come, you spirits That tend on mortal thoughts, unsex me here, And fill me, from the crown to the toe, top-full Of direst cruelty." (1, 5, 39-45). Lady Macbeth felt she had more manly power than her husband. She felt that she could do a better job of being king and murdering the present one. Lady Macbeth had the power that Macbeth needed.
The plan of the murder was all in Lady Macbeth's hands. She was the one who controlled it all. "Look like the time; bear welcome in you eye, Your hand, your tongue: look like th" innocent flower, But be the serpent under't he that's coming Must be provided for: and you shall put This night's great business into my dispatch- (1, 7, 62-66). Lady Macbeth showed Macbeth who was the boss. Macbeth never argued with his wife and did as he was told. Lady Macbeth had total control of Macbeth and the king's death.