تربیت نااهل، چون گردکان بر گنبد است.
tarbiyate na-ahl, chone gordekan bar gonbad ast.
Educating the unworthy is like a walnut on a dome.
Meaning
It is futile to try to teach or train someone who is unwilling or unable to learn.
Meaning
It is futile to try to teach or train someone who is unwilling or unable to learn.