How does Shakespeare develop the theme of jealousy through Iago's soliloquies?
Shakespeare is able to develop the theme of jealousy by creating a few main parts in the story where Iago goes over his thoughts after everyone else leaves the scene when is true plans and thoughts are revealed, dangerous plans of revenge and manipulation began to form. These plans were about ranking, Desdemona, and revenge in the cruelest form, murder.
Ranking
At the beginning of the story (act 1), Iago is furious at Othello for not electing him for the promotion of lieutenant rather giving it to Michael Cassio, a young and un-experienced soldier. While enraged about this arrangement he forms a plan with Roderigo to shout at Brabantio (Desdemona's father) "pester him, spoil his happiness,
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That’s the kind of argument you’d expect from Satan! When devils are about commit their biggest sins they put on their most heavenly faces, just like I'm doing now. And while this fool is begging Desdemona to help him, and while she’s pleading his case to the moor, I’ll poison the moor’s ear against her, hinting that she’s taking Cassio’s side because of her lust for him. The more she tries to help Cassio, the more she’ll shake Othello’s confidence in her and that’s how I’ll turn her good intentions into a big trap to snag them all” (page 115-117 modern text, no fear Shakespeare) he realizes that what he is doing is simply twisting a few words and filling Othello’s mind with jealousy, anger and fear (fear of