The Eyes of Envy from Golestan by Saadi Shirazi

Saadi says:
I once told a friend,
“I’ve grown silent most of the time,
because whenever we speak, both good and bad may slip out —
and the eyes of enemies see only the bad.”
My friend replied,
“Then such enemies are better off blind —
for they see no good in anything.”
And Saadi adds these verses:
The man of hatred passes not by the righteous,
without calling him a liar or a fool.
Virtue, in the eyes of envy, appears as vice.
Saadi is a rose — but to his enemies, he’s a thorn.
The radiant light of the sun itself
looks ugly to the eyes of a blind bat.