“Stella Adler always said no one could teach acting, but she could. She had a knack for teaching people about themselves, enabling them to use their emotions and bring out their hidden sensitivity. She also had a gift for communicating her knowledge; she could tell you not only when you were wrong, but why. Her instincts were unerring and extraordinary. If I hit a sour note in a scene, she knew it immediately and said, “No, wait, wait, wait…that’s wrong!” And then dug into her large reserve of intuitive intelligence to explain why my character would behave in a certain way based on the author’s vision.
Link to .pdf of NY Times interview with Brando 9/21/1975