"Look to your wife; observe her well with Cassio." Iago puts it in Othello's brain that Desdemona may be committing adultery with Cassio. But, Othello should have realized that there wasn't any time to commit this adultery. They got married, confessed their love to the Senator, left for the war, with Desdemona following, and then spent the wedding night together. When would Desdemona or Cassio have time to sleep with each other? Othello knew where Desdemona was at all times, it just doesn't add up.
These thoughts of adultery kept turning and churning in Othello's head. The thought of Desdemona with another man, especially his faithful officer Cassio, killed him. These thoughts turned into more, Othello soon could not think of anything else, and he started to really believe Desdemona cheated on him. .
"How now, my dear Othello! / Your dinner and the generous islanders / By you invited, do attend your.
presence. / I am to blame. / Why do you speak so faintly? /.
Are you not well? / I have a pain upon my forehead here.".
This is when the reader first sees Othello not talk to Desdemona with love and passion. He is very short with his words. Desdemona asks Othello what was wrong, and he answers with "I have a pain upon my forehead here." It is then that Desdemona should have realized what was really wrong. When he says he has a pain upon his forehead, he actually is theoretically meaning the cuckold's proverbial horns are starting to grow out of his forehead. A cuckold is a Mid English word meaning a man whose wife is unfaithful. But, being young and foolish Desdemona didn't realize what her husband's thoughts were. .
Iago's plan works quite well. He makes Othello believe it to such a high extent that he can't take it any more; Othello goes mentally insane. Iago caused this insanity, and it is this insanity that drives Othello to want to kill his once beloved wife. .
"Do it not with poison, strangle her in her bed, even the bed she hath contaminated.
