Some people can be influenced by others and can eventually lead them to a downfall. In this case, Macbeth was led to a tragic downfall by the role of supernatural. At the beginning of the play, Macbeth seemed to be a very loyal and honourable person. The witches prophecies, Lady Macbeth and Macbeth's ambitions all influenced Macbeth in several different ways, but, in the end, he is still responsible for his own destiny.
Firstly, the witches were the one's responsible for putting the idea that Macbeth would become king of Scotland in his head. The three witches say, "All hail Macbeth, that shalt be king hereafter." Macbeth's curiosity of how he could become king comes into play. As the play progresses, Macbeth slowly starts to rely more on the witches prophecies. The witches are clearly evil and deceiving and eventually lead to corruption of Macbeth. Macbeth creates his own misery when he is driven by his own guilt, which causes him to become more and more insecure about his actions. He would have never seriously thought about killing king Duncan without the witches influence. The witches never really had the power to affect the future of the play.
Secondly, Lady Macbeth, an ambitious woman, easily manipulated Macbeth. She manipulates his self-esteem by playing with his manliness and bravery. When Macbeth is hesitant on killing king Duncan, she scorns him, "But screw your courage to the stretching place, And we'll not fail." Lady Macbeth had success with altering his ambition. She wants her husband to become a more powerful man and help gain the throne. Macbeth loves his wife and will do anything to make her happy, so, he kills king Duncan. He starts to feel the guilt arise and wishes he could just awake him from his sleep, but it is undoable. Lady Macbeth brings out Macbeth's true side of evil and after the first murder, he will continue murdering to cover up his wrong doings. This is the main cause that increased Macbeth's ambition.