My wife says that stage acting is like being on a tightrope with no net, and being in the movies, there is a net - because you stop and go over it again. It's very technical and mechanical. On stage you're on your own.
What do I need a movie for? The stage is on a higher level in every way, and a more satisfying medium. Movies, by comparison, are like calendar art next to great paintings. You can't really do very much in movies or in television, but the stage is such an anarchistic medium.