Knock/talk some sense into somebody
Definition 1 of 2
Pro Tip 1/3Serious Effort
Used when someone sincerely tries to change another's misguided belief or behavior. 
After seeing his poor grades, his parents tried to knock some sense into him.
Pro Tip 2/3Negative Connotation
It can imply the person is being stubborn or foolish before the intervention. 
He's making rash decisions; it's time to knock some sense into him.
Pro Tip 3/3Metaphorical Force
It's metaphorical, not about real physical force, even if it sounds a bit aggressive. 
She's not thinking clearly; we need to knock some sense into her.