Stella Adler said this quote

You cannot afford to confine your studies to the classroom. The universe and all of history is your classroom.

~ Stella Adler

You have to understand your best. Your best isn't Barrymore's best or Olivier's best or my best, but your own. Every person has his norm. And in that norm every person is a star. Olivier could stand on his head and still not be you. Only you can be you. What a privilege! Nobody can reach what you can if you do it. So do it. We need your best, your voice, your body. We don't need for you to imitate anybody, because that would be second best. And second best is no better than your worst.

~ Stella Adler

You have to do something. If you do something, you become somebody. Even a daffodil does something, has a profession. It gives off scent, professionally.

~ Stella Adler

You will only fail to learn if you do not learn from failing.

~ Stella Adler