Iago uses his Machiavellian traits to use honesty, something imperative to Othello, as his machination against Othello
A02 - Iago
Repeats "Honest" after Othello speaks
Iago uses "honest" as a weapon to emphasise his villainy hidden through his facade
It is the initiating factor that causes the corrosion in Othello's mind; his marriage with Desdemona is based on honesty
A02 - Iago
Othello: "By heaven, he echoes me, as if there were some monster in his thought" (Act 3 Scene III)
Othello's dogmatic beliefs on honesty on truth mean he falls into Iago's trap, as he is convinced Iago's honesty is not letting him reveal the "monster"
For Othello, this is a sign of honesty, but ironic as the "monster" is trying to bring Othello down
A02 - Iago
Othello: "If thou dost love me/Show me thy thought"
Dramatic Irony as Iago does not love him
Othello's anxious tone shows that Iago's plan is being executed correctly, solidifying his manipulation
Also highlights the power shift, as Othello begs for the knowledge that he craves from Iago
A02 - Iago
Iago: "Men should be what they seem" (Act 3 Scene 3), juxtaposes his earlier claim that "I am not what I am" (Act 1 Scene 1)
Othello is falling for Iago's tricks and reinforces his 'honest' demeanour to fool Othello
The allusion to Exodus 3:14 is also enigmatic, but also highlights God negatively, portraying his diabolical figure
A02 - Iago
Othello: "by the world...thou art not" (Act 3 Scene III)
The seeds of doubt are beginning to flourish and surface into his mind
The antithesis highlights the overwhelming feelings Othello is experiencing
Iago abuses dispositional tendency to be jealous, and by overriding his mind with it, he will deteriorate
AO3
Male adultery was very common in Elizabethan times
Female adultery could have very violent consequences - A man who suspected his wife of infidelity could freely beat her with no legal recourse—unless he killed her.