Shakespear - a diseased spirit.

Macbeth’s ambitions are now stronger than his conscience. The witches have tempted and controlled him with the idea of becoming king. Lady Macbeth manipulates him to overcome his natural hesitation to commit murder. Due to his manipulation, Macbeth chooses the crown over his honor and material gain in this world over salvation in the next world. Once he has killed to get the crown, the other crimes seem inevitable. In order to keep what he has taken, Macbeth learns to lie and kill as a matter of course. His values become totally confused. "Fair is foul, and foul is fair" to him now; he has lost track of the difference. By the end of the play, manipulation by others has completely consumed Macbeth. Once Macbeth kills Duncan, he is committed to a course of lying and killing. His sense of right and wrong is eaten away. Even before Macbeth is killed, he is dying of a diseased spirit. Scotland is also infected, and Macbeth is its disease. Macbeth is a prime example of the corruption of power, and how absolute power corrupts absolutely. Shakespeare’s play Macbeth is a study of manipulation, control, and power.