Final answer:
The quote references Iago's suspicions in 'Othello' about an affair between his wife and Othello. These suspicions, based on mere suspicion and jealousy, fuel his destructive actions throughout the play. The phrase 'done my office' implies Othello taking Iago's place.
Step-by-step explanation:
This quote is taken from Shakespeare's play 'Othello', where the character Iago displays his hatred towards the Moor, Othello. In this context, 'done my office' is an innuendo indicating his suspicions about an affair between Othello and his wife. He implies that Othello has slept with his wife, effectively taking his place ('doing his office'). Though this is based on mere suspicion and jealousy, it is the fuel for Iago's destructive actions against Othello throughout the play.
This self-fueling rage and jealousy, based on unproven accusations, is a critical component of Iago's character. It illustrates his manipulative nature and willingness to harm others based on unconfirmed suspicions and evil intentions.
Learn more about Shakespeare's Othello