"I still feel that a movie has to attempt to say something - even if it fails miserably. But I've sort of given up on believing that I'm going to change the world with every film I choose to act in"

In this quote, Sarah Polley expresses her belief that a movie need to have a message or purpose, even if it eventually fails. Nevertheless, she also acknowledges that she has actually released the concept that every movie she acts in will have a profound impact on the world. This might recommend that she has actually come to terms with the constraints of the film market and the power of specific efficiencies. It could also show a sense of realism and humbleness, acknowledging that not every project will be an innovative success. In general, Polley's words convey a sense of balance in between creative ambition and usefulness.