I Was Wrong. Goodbye

"Soft you; a word or two before you go.
I have done the state some service and they know't:
No more of that. I pray you, in your letters
When you shall these unlucky deeds relate,
Speak of me as I am, nothing extenuate,
Nor set down aught in malice. Then must you speak
Of one that lov'd not wisely, but too well;
Of one not easily jealous but, being wrought,
Perplex'd in the extreme; of one whose hand,
Like the base Indian, threw a pearl away
Richer than all his tribe; of one whose subdued eyes,
Albeit unused to the melting mood,
Drops tears as fast as the Arabian trees
Their medicinable gum. Set you down this;
And say besides that in Aleppo once
Where a malignant and a turban'd Turk
Beat a Venetian and traduced the state,
I took by th'throat  the circumcised dog
And smote him thus"

Othello
Act 5 ii. 334-52

Jealousy

             Thy Iago, oh honest Iago. How I should have known you were too good to be true. Jealousy was with you from the moment I gave Cassio Lieutenant instead of thy. Oh jealousy be thy cause of chaos. You planned to ruin all that was well. If only I would have known. I would have planned a way to keep order. "O beware, my lord, of jealousy: It is the green-eyed monster which doth mock the meat it feeds on" Ha! Tis not I who is jealous, it was you. The green-eyed monster you spoke of, was clearly yourself. My sweet, sweet Desdemona would still be alive if it were not for your jealousy and scheming. I let your lies take over me. I trusted what you were saying, and became jealous myself. Oh I am no better than thee. I got taken away from what was right and didn't realize it until everything was gone. Oh monstrous fate! 

Iago to Othello
Act 3 iii. 167-8