Macbeth, in Macbeth by Shakespeare, is influenced in many ways. Lady Macbeth influenced Macbeth in his decision to kill Duncan, the witches influenced him to become king, and his own conscience influenced himself to go through with killing others that had suspicions of him or his plans.
Macbeth's decision to kill Duncan, the king, was not made just on his judgment alone, but also on the judgment of Lady Macbeth, his wife. Macbeth was unsure of whether or not to go through with his plan, but after the encounter with Lady Macbeth and her calling him a coward, he went through with it. "Wouldst thou have that which thou esteem'st the ornament of life, and live a coward in thine own esteem, Letting "I dare not" wait upon "I would," like the poor cat t" the" adage?" (1.7.42-45).
Macbeth had always dreamed of becoming king and his encounter with the witches had made him believe it more. It showed him that he"d do anything to become the king he's always wanted to be. The witches told him that he"d become Thane of Cawdor and then to become king. "First witch: "All Hail, Macbeth! Hail to thee, Thane of Glamis." Second Witch: "All Hail, Macbeth! Hail to thee, Thane of Cawdor." Third Witch: All Hail, Macbeth! That shalt be king hereafter."" (1.3.48-50).
Macbeth had always dreamed of becoming king and his encounter with the witches had made him believe it more. It showed him that he"d do anything to become the king he's always wanted to be. The witches told him that he"d become Thane of Cawdor and then to become king. "First witch: "All Hail, Macbeth! Hail to thee, Thane of Glamis." Second Witch: "All Hail, Macbeth! Hail to thee, Thane of Cawdor." Third Witch: All Hail, Macbeth! That shalt be king hereafter."" (1.3.48-50).
Macbeth's conscience was also always a bother to him. It made him mad thinking of all that he"d done and all the pain that he"d caused which sometimes caused him to do more evil than good.