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“For God’s sake, sir, you’ve been robbed. Get dressed. Your heart’s going to break. It’s like half your soul’s been ripped out. At this very minute an old black ram is having sex with your little white lamb. Wake up, wake up, ring a bell and wake up all the snoring citizens. If you wait too long you’ll have black grandchildren. Get up, I tell you!”
Scene 1; line 88-93

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Iago tells Desdemona’s father that he is being robbed of his daughter. Iago tells him it is be Othello. Brabantio is upset and tries to find his daughter with the intent to hurt Othello.

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In the streets of Venice, Italy.

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This incident leads Brabantio to have a hate for Othello, even though he earned his daughter rightfully, without the use of black magic.

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“If I can just get him to drink one more glass after what he’s drunk already, he’ll be as argumentative and eager to fight as a little dog. That fool Roderigo, all twisted up inside with love, has been drinking toasts to Desdemona by the gallon, and he’s on guard duty.I’ve gotten the rest of the guards drunk, as well as several gentlemen from Cyprus who are quick to take offense. Now I’ll get Cassio to do something in front of all these drunkards that will offend everyone on the island. Here they come. If the future turns out as I hope it will, I’m all set for success.”
Scene 3; line 30-39

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Iago cites his plan to get Cassio drunk, so he will commit an action that will disgrace him. Cassio eventually stabs Montano.

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In someone's chambers, in Cyprus.

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Iago is using Cassio, since he is close with Desdemona. Then, Cassio will ask for Desdemona’s help so he can be right with Othello. This will lead to Iago making Othello think that Cassio and his wife are having an affair.

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"I’ll send her out to you now. I’ll think of a plan to get the Moor out of the way, so you can speak more openly." Scene 1; line 25-27

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Cassio and Iago are talking about how Cassio has fallen for Desdemona. Iago is saying how he wants to help him and how he’ll distract Othello, so that Cassio and Desdemona can talk alone without the worry of Othello overhearing.

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In someone's chambers, in Cyprus.

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Iago sets up and manipulates
every given situation so that it seems the complete opposite of
what’s actually happening. This ends up being what started the entire incident/problem.

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Go ahead, swear to that, so you’ll be damned to hell for lying. Otherwise the devils will mistake you for an angel and be too scared to grab you. Go ahead, make sure you damn yourself by swearing you’ve been faithful to me. Scene 2; line 40-42

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Othello accuses Desdemona of being a whore, and not being faithful to him. He believes that she is having and affair with Cassio. We, the readers, know that Iago is the villain of the story and he has tricked Othello into thinking this. Iago uses his words to break down Othello. This becomes too much for Othello to handle, and he proceeds to have a seizure.

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In someone's chambers, in Cyprus.

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The characters respond to tension building up, and Iago’s plan to trick Othello is working. The information becomes too much to handle, and the reader is left wondering what Othello’s next steps will be. Tragic elements are beginning to take place, as we can see by Othello’s rage, and the sexual jealousy caused by Iago.

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“Here, stand behind this wall; he’ll come right away. Keep your sword out, and then stick it in as far as it’ll go. Quick, quick. Don’t be afraid. I’ll be right next to you. This will either make us or break us. Keep that in mind, and be steady.” Scene 1; line 35-37

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Iago proceeds to tell Othello how he should go about killing Cassio.

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In someone's chambers, in Cyprus.

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This is the starting point of all the killings throughout Act 5 and this clearly shows how Iago's plan has worked out.

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“If I were the Moor I wouldn’t want to be Iago. I may seem to love and obey him, but in fact, I’m just serving him to get what I want.” Scene 1

This is the start of Iago’s plan of deception. Here, Iago is upset that he was passed over by Othello for a promotion to be Othello's right hand man in the military, and now he will make it his duty to get revenge on Othello by destroying him.

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"I’d bet my life she’d never lie to me. Iago, I’m leaving my dear Desdemona with you. Have your wife attend to her, and bring them along as soon as you can. Come on, Desdemona, I’ve only got an hour of love to spend with you, to tell you what you need to do. We’re on a tight schedule." Scene 1

Iago now gains Othello's trust and is ready to start his plan of manipulation and deceit.

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“Damn her, the wicked whore! Oh, damn her!... I’m going inside to think up some way to kill that beautiful devil. You’re (Iago) my lieutenant now.” Scene 3

After having had a conversation with Iago about his relationship, and Desdemona's faithfulness, he is enraged and uses crude language such as "Damn her, the wicked whore". We observe a change in Othello here.

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“In bed with her? On top of her? I would have thought people were telling lies about her rather than believe he was lying on her. My God, it’s nauseating!   Handkerchief — confessions — handkerchief! I’ll kill him first, and then let him confess — I’m trembling with rage. I wouldn’t be trembling like this if I didn’t know deep down this was all true. Noses, ears, lips. Is it possible? Tell me the truth — Handkerchief — Damn it!”

At the start of the play he probably wouldn’t turn to killing her, but because of the relentless persistence by Iago his mind is changing.

“So confess your sin freely now. Even if you swear you’re innocent of every accusation, you won’t change my mind or remove the thought that’s tormenting me. You’re going to die.”

Othello is ready to kill Desdemona.

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“I am not what I am” Scene 1

This contradiction is the reader’s early introduction to Iago. This quote clearly establishes Iago’s intent on being duplicitous, where he will appear to be loyal, but his true motives are evil.

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“I’ll send her out to you now. I’ll think of a plan to get the Moor out of the way, so you can speak more openly.” Scene 2

Iago tells Cassio that he will distract Othello that Cassio can speak with Desdemona. Iago is using Cassio , so that he falls for Desdemona so it causes Othello to suspect an issue with his marriage.

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"Beware of jealousy, my lord! It’s a green-eyed monster that makes fun of the victims it devours. The man who knows his wife is cheating on him is happy, because at least he isn’t friends with the man she’s sleeping with. But think of the unhappiness of a man who worships his wife, yet doubts her faithfulness. He suspects her, but still loves her." (Scene 4)

Iago uses persuasive tactics to get what he wants, and to have his way. Othello falls for this, just as Iago had planned.  His personality is one of very evil manners. However, nothing truly describe his reasoning for revenge, or his hatred for Othello. He is willing to take revenge on anyone, making his character even more threatening.

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"If I can be frank with you, she veered away from her own nature in turning down all those young men from her own country, with her skin color, with her status—everything her nature would have drawn her to—Ugh! You can almost smell the dark and ugly desires inside her, the unnatural thoughts—But—I’m sorry—I didn’t mean to refer to her specifically just now. I only worry that she might snap back to her natural taste in men one day, and compare you unfavorably to other Italians." (Combined quote that applies to Act 4 and 5)

Iago shares his thoughts with Othello causing Othello to be in accordance with him. This quote, in my view, is what sets off Othello go to through with his plan to kill Desdemona

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“Anybody with eyes could tell you that a beautiful and happy young girl like her, who’s refused to marry all of the handsome young men of the city, wouldn’t run off with a black thing like you unless she’d been bewitched.” Scene 3

Here, Brabantio has confronted Othello with allegations that he has kidnapped and drugged is daughter Desdemona. Brabantio is clearly prejudice against Othello, as he accuses him of a “crime” that he did not commit based on the colour of his skin.

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Like hell she is! She’s made of the same flesh and blood as everyone else. If she were so moral, she would never have fallen in love with the Moor in the first place. Good lord! Did you notice how she and Cassio were fondling each other’s hands? Did you see that?    Scene 1

Iago explains that if Desdemona had values, she wouldn't have married a Moor.

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"Oh, I’d kill that bastard Cassio forty thousand times if I could! Killing him once is not enough revenge. Now I see it’s true. Oh, Iago, all the love I felt is gone, vanished in the wind. Welcome, hatred and vengeance! Get out of my heart, love! My heart feels like it’s full of poisonous snakes!"

Othello is fed up with everything Cassio has ever done to him including all the racial slurs and implications.