Quotes & Sayings About Iago's Jealousy

The word "jealousy" is often used as if it were synonymous with envy; but I think the distinction worth preserving. Jealousy is predominantly concerned with the fear of loss of something one possesses, envy with the wish to own something another possesses. Othello suffers from the fear that he has lost Desdemona's love. Iago suffers from envy of the position held by Cassio, to which he feels entitled. — Anthony Storr

Why, why is this?
Think'st thou I'ld make a lie of jealousy,
To follow still the changes of the moon
With fresh suspicions? No; to be once in doubt
Is once to be resolved: exchange me for a goat,
When I shall turn the business of my soul
To such exsufflicate and blown surmises,
Matching thy inference. 'Tis not to make me jealous
To say my wife is fair, feeds well, loves company,
Is free of speech, sings, plays and dances well;
Where virtue is, these are more virtuous:
Nor from mine own weak merits will I draw
The smallest fear or doubt of her revolt;
For she had eyes, and chose me. No, Iago;
I'll see before I doubt; when I doubt, prove;
And on the proof, there is no more but this,
Away at once with love or jealousy! — William Shakespeare