Too much sanity may be madness!
In the night all cats are gray.
Jealousy sees things always with magnifying glasses which make little things large, of dwarfs giants, of suspicions truths.
Wit and humor do not reside in slow minds.
All the vices, Sancho, bring some kind of pleasure with them; but envy brings nothing but irritation, bitterness, and rage.
There is no proverb that is not true.