talk some sense into (one)
To assist or persuade one to start thinking sensibly (about something). Jason is convinced that he wants to join the circus, but I'm hoping we'll be able to talk some sense into him. If you think you're going to find a high-paying job right away without any experience, then you need someone to talk some sense into you.
knock/talk some ˈsense into somebody
(informal) try to persuade somebody to stop behaving in a stupid way, sometimes using rough or violent methods: I wish somebody would knock some sense into our politicians.Try and talk some sense into her before she makes the wrong decision.