V:28
Jealousy is, in a way, just and reasonable, because its aim is merely to retain something that belongs to us, or that we think belongs to us; whereas envy is a frenzy that cannot endure the fact that other people possess anything.
La Rochefoucauld - Maxims
IAGO:
Oh, beware, my lord, of jealousy!
It is the green-eyed monster which doth mock
The meat it feeds on. That cuckold lives in bliss
Who, certain of his faith, loves not his wronger;
But, oh, what damnèd minutes tells he o'er
Who dotes, yet doubts; suspects, yet soundly loves.
William Shakespeare - Othello (3,3)
Curiosity is always at fault ; here it is baleful. It is madness to want to find out about an ill for which there is no treatment except one which makes it worse and exacerbates it; one the shame of which is spread abroad and augmented chiefly by our jealousy; one which to avenge means hurting our children rather than curing ourselves. You wither and die while hunting for such hidden truth. How wretched are those husbands in my days who manage to find out!
Michel de Montaigne - Essays, On some lines of Virgil (III, 5)