Never thrust your sickle into another's corn.
He who has a mind to do mischief will always find a pretense.
When a woman is undisguisedly bad, then indeed she is good. [Comparatively speaking, as she at least lacks deception.]
Equanimity is calamity's medicine.
Alas how difficult is it to preserve a high reputation!
The coward regards himself as cautious, the miser as thrifty.