When a stone hits glass, the glass breaks. When glass hits a stone, the glass breaks.
More Persian Proverbs:
I have no right to rejoice at the death of my enemy when I do not have eternal life myself.Persian
Debts are like women, once you have them you can't get rid of them.
Persian
A snake can change its skin but not its disposition.
Persian
Flies will easily fly into the honey -- their problem is how to get out.
Persian
You can't take blood from a stone.
Persian
Do men gather grapes of thorns, or figs of thistles?
Persian