I don't rehearse films as much as opera or theatre. When I began directing films I thought a long rehearsal was a good idea. Experience showed me that the best performance was often left in a rehearsal room. ↗
There were movies that always made me want to be a director. You see brilliant scenes and the way the emotions were handled. I thought, I'd really like to do that. ↗
It is pretty clear that they are ineffective in stopping the course of thought at present, but they have not always been so in the past and we cannot be sure that they will not be so in the future. ↗