Fair is foul and foul is fair The text Macbeth is asphyxiated in themes of treachery dishonesty deception shown by the quote Fair is foul and foul is fair This quote shows that despite the fact that something appears to be devout and pure it may underneath be treacherous and evil The text is smothered in lies and betrayal from various characters Shakespeare portrays this theme through the Witches and Hecates meandering of Macbeths prophecy which tricks Macbeth in to believing he is insuperable