"Then I heard this genius teacher Stella Adler - I recommend you read anything you might find about her and if you have anyone interested in theatre, you get them one of her books"

Harvey Keitel is advising that individuals check out the genius teacher Stella Adler and get her books for anybody thinking about theatre. This recommends that Stella Adler was an influential figure in the theatre world and her teachings were extremely regarded. Harvey Keitel likely had a personal connection to Stella Adler, as he is recommending her books to others. He likely believes that her teachings are important and that they can help individuals interested in theatre to find out and grow. Stella Adler was likely a mentor to Harvey Keitel, and he is now handing down her wisdom to others. He is most likely positive that her teachings will assist others to end up being successful in the theatre world.