Shakespeare contrasts Iago against Othello's nobility and integrity of character.
While the play suggests motives for Iago's hateful scheming, many readers feel that a deeper root remains unhidden. Iago cites suspicion that his wife has been unfaithful to him with Othello or bitterness that Othello passed him up for a big promotion. Whatever his deepest motivation, his hatred towards the Moor is unwavering and moves the action of the play forward. Some modern directors interpret Iago's hate as racism.