You can’t take blood from a stone.
More Persian Proverbs:
Go as far as you can see, and when you get there you'll see further.Persian
Giving advice to the ignorant is like the rain falling on muddy ground.
Persian
What is brought by the wind will be carried away by the wind.
Persian
Courtesy on one side can never last long.
Persian
The hand that gives is also the one that receives.
Persian
The mud that you throw will fall on your own head.
Persian