I completely agree with your statement, tahmed1. It is insane that he is calling Othello his "good lord" while wanting to ruin his life. This feels something like a biblical reference to me. I do not know too much about religion, but I do know that in many religions believe in god and the idea of the devil. At one point, the devil was actually one of gods angels that turned on him. This line seems very mirroring of the relationship between the devil and god before they were enemies. Obviously Shakespeare would include this biblical reference to further develop Iago's evil character. As a side note, this also really reminded me of the relationship between Wormtail and Voldemort, because Wormtail always pretends to be loyal to Voldemort when he is really only looking out for himself.

Again, dramatic irony is created. Cassio is making a fool out of himself for thousandth time by calling Iago an honest man. I also believe that Shakespeare specifically included that Iago was more kind and honest because of his Italian descent in this line. This contributes to the ongoing theme of racism in the play, as Othello is always viewed as a less honest man for his african descent. While this shows racism, it is ironic for the audience to hear because this time the racist ideology that african men are less honest and more evil then Italian men is disproved. This seems like one of Shakespeare's many attempts to show his disapproval of racism and stereotypes of his time.

This whole scene is very interesting. When I think deeply about the scene and Cassio speaking to this clown it seems very metaphorical. Especially this line. It almost feels like the "clown" is an inner voice fighting with Cassio in his head, asking him if he has made the right choice to let Iago control his destiny with Desdemona. The clown is clearly used by Shakespeare to reveal the stupidity and level of desperate that Cassio has reached in his attempt to reach Desdemona. Once again, Shakespeare develops his ongoing theme of dramatic irony.

I agree with karenvillas idea that Iago could be yet another reference to racism or the association of black culture and black magic. Maybe Shakespeare includes this to help the reader better understand that, although Othello takes the bad wrap for being a "moor," it is actually the venician Iago that is evil. I also think that it is important to note that this is so ironic! Iago is calling his manipulation and lies medicine, when it is clearly not helping people, its only hurting everyone in the situation and even ends up killing many. The "medicine" is actually poison. I also feel like the medicine that Iago is talking about is jealousy. Iago wants jealousy to have such an effect on Othello that he acts out. The idea of medicine is really powerful, as medicines can be used as life saving drugs but they also can be abused and used when they are not needed. Obviously, in this case, the medicine that Iago is feeding Othello is not going to help Othello in any ways. The "medicine" is actually the making Othello sick with envy.