From a touching and thoughtful remembrance by Molly Ringwald in the NYTimes:
John saw something in me that I didn’t even see in myself. He had complete confidence in me as an actor, which was an extraordinary and heady sensation for anyone, let alone a 16-year-old girl. I did some of my best work with him. How could I not? He continually told me that I was the best, and because of my undying respect for him and his judgment, how could I have not believed him?