Jealousy in romance is like salt in food. A little can enhance the savor, but too much can spoil the pleasure and, under certain circumstances, can be life-threatening.
Who loves the golden mean is safe from the poverty of a tenement, is free from the envy of a palace.
[Lat., Auream quisquis mediocritatem deligit tutus caret obsoleti sordibus tecti, caret invidenda sobrius aula.]
We make ourselves fools to disport ourselves And spend our flatteries to drink those men Upon whose age we void it up again With poisonous spite and envy.
We envy only those whom we feel ourselves to be like; we envy only members of our reference group. There are few successes more unendurable than those of our close friends.