There is a Jewish saying "If I am not for myself then who am I" saying if you don't fight for yourself no one will.
This doesn't only apply to yourself this also applies to a child. You are the only one who will do everything you can for your child, or your students. That is why you have you have to believe in them. No one else will work to find at the good things in your child which can give them so much of a better life. Even if it's not something that looks the best help your child grow in their strong points.
I'll post something more on this tommorow.