Part came from Lane, and part from D.H. Lawrence; Gide, though I didn't know it then, gave part. They taught me to express my deep abhorrence If I ca… - W. H. Auden

"As for Iago’s jealousy, one cannot believe that a seriously jealous man could behave towards his wife as Iago behaves towards Emilia, for the wife of a jealous husband is the first person to suffer. Not only is the relation of Iago and Emilia, as we see it on stage, without emotional tension, but also Emilia openly refers to a rumor of her infidelity as something already disposed of.

Some such squire it was
That turned your wit, the seamy side without
And made you to suspect me with the Moor.

At one point Iago states that, in order to revenge himself on Othello, he will not rest till he is even with him, wife for wife, but, in the play, no attempt at Desdemona’s seduction is made. Iago does not encourage Cassio to make one, and he even prevents Roderigo from getting anywhere near her.

Finally, one who seriously desires personal revenge desires to reveal himself. The revenger’s greatest satisfaction is to be able to tell his victim to his face – "You thought you were all-powerful and untouchable and could injure me with impunity. Now you see that you were wrong. Perhaps you have forgotten what you did; let me have the pleasure of reminding you."

When at the end of the play, Othello asks Iago in bewilderment why he has thus ensnared his soul and body, if his real motive were revenge for having been cuckolded or unjustly denied promotion, he could have said so, instead of refusing to explain."

"Iago’s treatment of Othello conforms to Bacon’s definition of scientific enquiry as putting Nature to the Question. If a member of the audience were to interrupt the play and ask him: "What are you doing? could not Iago answer with a boyish giggle, "Nothing. I’m only trying to find out what Othello is really like"? And we must admit that his experiment is highly successful. By the end of the play he does know the scientific truth about the object to which he has reduced Othello. That is what makes his parting shot, What you know, you know, so terrifying for, by then, Othello has become a thing, incapable of knowing anything.

And why shouldn’t Iago do this? After all, he has certainly acquired knowledge. What makes it impossible for us to condemn him self-righteously is that, in our culture, we have all accepted the notion that the right to know is absolute and unlimited. […] We are quite prepared to admit that, while food and sex are good in themselves, an uncontrolled pursuit of either is not, but it is difficult for us to believe that intellectual curiosity is a desire like any other, and to realize that correct knowledge and truth are not identical. To apply a categorical imperative to knowing, so that, instead of asking, "What can I know?" we ask, "What, at this moment, am I meant to know?" – to entertain the possibility that the only knowledge which can be true for us is the knowledge we can live up to – that seems to all of us crazy and almost immoral. But, in that case, who are we to say to Iago – "No, you mustn’t."

Laziness acknowledges the relation of the present to the past but ignores its relation to the future; impatience acknowledge its relation to the future but ignores its relation to the past; neither the lazy nor the impatient man, that is, accepts the present instant in its full reality and so cannot love his neighbour completely.