What is this quote: "Johnny," Dally said in a pleading, high voice, using a tone I had never heard from him before, "Johnny, I ain't mad at you. I just don't want you to get hurt. You don't know what a few months in jail can do to you.

In this quote, Dally, who Johnny perceived as being angry, is trying to make Johnny, who he sees as a brother, understand the consequences of his actions. Having spent time in jail, Dally understands what is at stake. He is trying to protect him.