“That stupid saying "What you don't know can't hurt you" is ridiculous. What you don't know can kill you. If you don't know that tractor trailer trucks hurt when hitting you, then you can play in the middle of the interstate with no fear - but that doesn't mean you won't get killed.”
“Trust me, you can't play the game if you don't know the rules. And if you don't know the rules, someone's bound to get hurt.”
“How can I love you if I don't know what hurts you?”
“What you don't know may not hurt you, but what you don't remember always does.”
“The devil that can hurt you is the devil you don't know”