We see in the play Macbeth that when the motivation to succeed in life becomes overpowering, he falls from a state of grace to a descent of insanity. He had many influential people that led him to this fall. The witches and the apparitions, Lady Macbeth, and lastly Macbeth's own insecurities and misguided attempts to control his future.
In the beginning, we see that Macbeth is very content and happy with his life. Everything is going good with him and his family. That is until he has an encounter with the witches one afternoon. They inform Macbeth that he will be king; this apparition given by the witches makes Macbeth contemplate Duncan's murder. He obviously has great faith in the witches' words because Macbeth immediately writes Lady Macbeth. "'They met me in the day of success; and I have learned by the perfectest report, they have more in them than mortal knowledge." (Act I, Scene 5). These predictions caused Macbeth to begin to slip into his on world; he started to believe that he could do whatever he wanted to please himself.
Lady Macbeth was the second influential person in Macbeth's life. The moment he confided with Lady Macbeth it was obvious that he was not in state of grace anymore because of his contemplation of the murder of Duncan. Macbeth is known as a kind, gentle person so one would not expect Macbeth to consider murdering anyone. Lady Macbeth decides that she will manipulate Macbeth into killing Duncan. After Macbeth finally agrees to murder the king, and the time comes for him to kill Duncan we can see that he is undoubtedly going insane. In Act II, Scene 1, Macbeth speaks of a dagger floating before him. We can now be sure that Macbeth has left his graceful state of mind and has now entered into insanity. .
After he is named king, Macbeth's misery and eventual downfall is caused by his own insecurities and misguided determination to take control of his future.