It's difficult, if not ...

It's difficult, if not impossible, to get away with anything false before the camera. That instrument penetrates the husk of the actor; it reveals what's truly happening - if anything, if nothing. A close-up demands absolute truth. It's a severe and awesome truth
 Elia Kazan

Quotes from the same author

The motion pictures I have made and the plays I have chosen to direct represent my convictions.
 Elia Kazan
One final thing a director needs: The ability to say 'I am wrong' or 'I was wrong.' Not as easy as it sounds. But in many situations, these 3 words, honestly spoken, will save the day.
 Elia Kazan
You've got to keep fighting; you've got to risk your life every six months to stay alive.
 Elia Kazan
I was able to capture on film things the actors didn't even know they were doing.
 Elia Kazan
I want to thank the Academy for its courage and generosity.
 Elia Kazan