This is evident through Othello's actions and change in language throughout the play. Othello's language begins as poetic and lyrical as shown in his declaration of love to Desdemona, as shown in his descriptive language in Act 2, "most patent grave signious", but is juxtaposed through his venomous pronouncements of hatred towards Desdemona with his dialogue in Act 4, "I will chop her into messes." The dramatic structure of the play clearly unveils the downfall of Othello through his tragic flaw jealousy. .
Not only does Shakespeare explore the key idea of jealousy within the play, but he also explores the theme of deception, primarily through the antagonist Iago. The characterisation of Iago is reflected through his deceptive plan which can be displayed through the dramatic irony of his dialogue in Act 1 Scene 1, "I follow him to serve my turn upon him". Immediately it is shown in the play that Iago is not an honest or noble character. His motives are made clear; being that he will gain Othello's trust so that Othello will believe his lies. By revealing his plan to deceive Othello so early in the play it creates dramatic tension from the beginning of the play. Whilst Iago manipulates and deceives Othello, the audience is aware that only devastation and tragedy will follow. .
As the play continues and Othello's downfall nears, Iago persistently deceives him in order to strengthen Othello's belief that Desdemona has deceived him. As he did at the beginning of the play, Iago continues to gain Othello's trust through lies and deception. The first person language, "I am your own for ever" reinforces Iagos dishonest and deceitful character which drives his scheme against Othello. The deceptive plan sparks Othello's tragic flaw which leads to his downfall, thus making the idea of deception in the play Othello a vital theme. Throughout Othello, Shakespeare portrays the idea of honour and reputation as being the most important aspect in a man's life.
