Necessity turns lion into fox.
More Persian Proverbs:
A thief is a king until he is caught.Persian
You cannot hang everything on one nail.
Persian
If you enter the city of the blind, cover your eyes.
Persian
Beware a rickety wall, a savage dog, and a quarrelsome person.
Persian
You can't polish a turd.
Persian
An ungrateful son is a wart on his father's nose -- he leaves it, it's ugly, he removes it, it hurts.
Persian